diff --git a/pkg/grpc/base_client_factory.go b/pkg/grpc/base_client_factory.go
index 8fd9031a..20629c07 100644
--- a/pkg/grpc/base_client_factory.go
+++ b/pkg/grpc/base_client_factory.go
@@ -189,10 +189,14 @@ func (cf baseClientFactory) NewClientFromConfiguration(config *configuration.Cli
 	}
 
 	// Optional: service config.
-	if serviceConfig := config.DefaultServiceConfig; serviceConfig != "" {
+	if serviceConfig := config.DefaultServiceConfig; serviceConfig != nil {
+		serviceConfigJSON, err := serviceConfig.MarshalJSON()
+		if err != nil {
+			return nil, util.StatusWrap(err, "Failed to marshal default service config")
+		}
 		dialOptions = append(
 			dialOptions,
-			grpc.WithDefaultServiceConfig(serviceConfig))
+			grpc.WithDefaultServiceConfig(string(serviceConfigJSON)))
 	}
 
 	dialOptions = append(
diff --git a/pkg/proto/configuration/grpc/BUILD.bazel b/pkg/proto/configuration/grpc/BUILD.bazel
index 22927950..39b17cda 100644
--- a/pkg/proto/configuration/grpc/BUILD.bazel
+++ b/pkg/proto/configuration/grpc/BUILD.bazel
@@ -12,6 +12,7 @@ proto_library(
         "//pkg/proto/configuration/tls:tls_proto",
         "@protobuf//:duration_proto",
         "@protobuf//:empty_proto",
+        "@protobuf//:struct_proto",
     ],
 )
 
diff --git a/pkg/proto/configuration/grpc/grpc.pb.go b/pkg/proto/configuration/grpc/grpc.pb.go
index cafccef4..cd3e9366 100644
--- a/pkg/proto/configuration/grpc/grpc.pb.go
+++ b/pkg/proto/configuration/grpc/grpc.pb.go
@@ -14,6 +14,7 @@ import (
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	durationpb "google.golang.org/protobuf/types/known/durationpb"
 	emptypb "google.golang.org/protobuf/types/known/emptypb"
+	structpb "google.golang.org/protobuf/types/known/structpb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -40,7 +41,7 @@ type ClientConfiguration struct {
 	InitialConnWindowSizeBytes    int32                                  `protobuf:"varint,9,opt,name=initial_conn_window_size_bytes,json=initialConnWindowSizeBytes,proto3" json:"initial_conn_window_size_bytes,omitempty"`
 	ProxyUrl                      string                                 `protobuf:"bytes,10,opt,name=proxy_url,json=proxyUrl,proto3" json:"proxy_url,omitempty"`
 	Tracing                       map[string]*TracingMethodConfiguration `protobuf:"bytes,11,rep,name=tracing,proto3" json:"tracing,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	DefaultServiceConfig          string                                 `protobuf:"bytes,13,opt,name=default_service_config,json=defaultServiceConfig,proto3" json:"default_service_config,omitempty"`
+	DefaultServiceConfig          *structpb.Struct                       `protobuf:"bytes,13,opt,name=default_service_config,json=defaultServiceConfig,proto3" json:"default_service_config,omitempty"`
 }
 
 func (x *ClientConfiguration) Reset() {
@@ -143,11 +144,11 @@ func (x *ClientConfiguration) GetTracing() map[string]*TracingMethodConfiguratio
 	return nil
 }
 
-func (x *ClientConfiguration) GetDefaultServiceConfig() string {
+func (x *ClientConfiguration) GetDefaultServiceConfig() *structpb.Struct {
 	if x != nil {
 		return x.DefaultServiceConfig
 	}
-	return ""
+	return nil
 }
 
 type ClientKeepaliveConfiguration struct {
@@ -978,276 +979,279 @@ var file_pkg_proto_configuration_grpc_grpc_proto_rawDesc = []byte{
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 }
 
 var (
@@ -1279,11 +1283,12 @@ var file_pkg_proto_configuration_grpc_grpc_proto_goTypes = []any{
 	nil,                                                // 12: buildbarn.configuration.grpc.ClientConfiguration.TracingEntry
 	nil,                                                // 13: buildbarn.configuration.grpc.ServerConfiguration.TracingEntry
 	(*tls.ClientConfiguration)(nil),                    // 14: buildbarn.configuration.tls.ClientConfiguration
-	(*durationpb.Duration)(nil),                        // 15: google.protobuf.Duration
-	(*emptypb.Empty)(nil),                              // 16: google.protobuf.Empty
-	(*tls.ServerConfiguration)(nil),                    // 17: buildbarn.configuration.tls.ServerConfiguration
-	(*auth.AuthenticationMetadata)(nil),                // 18: buildbarn.auth.AuthenticationMetadata
-	(*jwt.AuthorizationHeaderParserConfiguration)(nil), // 19: buildbarn.configuration.jwt.AuthorizationHeaderParserConfiguration
+	(*structpb.Struct)(nil),                            // 15: google.protobuf.Struct
+	(*durationpb.Duration)(nil),                        // 16: google.protobuf.Duration
+	(*emptypb.Empty)(nil),                              // 17: google.protobuf.Empty
+	(*tls.ServerConfiguration)(nil),                    // 18: buildbarn.configuration.tls.ServerConfiguration
+	(*auth.AuthenticationMetadata)(nil),                // 19: buildbarn.auth.AuthenticationMetadata
+	(*jwt.AuthorizationHeaderParserConfiguration)(nil), // 20: buildbarn.configuration.jwt.AuthorizationHeaderParserConfiguration
 }
 var file_pkg_proto_configuration_grpc_grpc_proto_depIdxs = []int32{
 	14, // 0: buildbarn.configuration.grpc.ClientConfiguration.tls:type_name -> buildbarn.configuration.tls.ClientConfiguration
@@ -1291,34 +1296,35 @@ var file_pkg_proto_configuration_grpc_grpc_proto_depIdxs = []int32{
 	11, // 2: buildbarn.configuration.grpc.ClientConfiguration.add_metadata:type_name -> buildbarn.configuration.grpc.ClientConfiguration.HeaderValues
 	2,  // 3: buildbarn.configuration.grpc.ClientConfiguration.oauth:type_name -> buildbarn.configuration.grpc.ClientOAuthConfiguration
 	12, // 4: buildbarn.configuration.grpc.ClientConfiguration.tracing:type_name -> buildbarn.configuration.grpc.ClientConfiguration.TracingEntry
-	15, // 5: buildbarn.configuration.grpc.ClientKeepaliveConfiguration.time:type_name -> google.protobuf.Duration
-	15, // 6: buildbarn.configuration.grpc.ClientKeepaliveConfiguration.timeout:type_name -> google.protobuf.Duration
-	16, // 7: buildbarn.configuration.grpc.ClientOAuthConfiguration.google_default_credentials:type_name -> google.protobuf.Empty
-	17, // 8: buildbarn.configuration.grpc.ServerConfiguration.tls:type_name -> buildbarn.configuration.tls.ServerConfiguration
-	6,  // 9: buildbarn.configuration.grpc.ServerConfiguration.authentication_policy:type_name -> buildbarn.configuration.grpc.AuthenticationPolicy
-	4,  // 10: buildbarn.configuration.grpc.ServerConfiguration.keepalive_enforcement_policy:type_name -> buildbarn.configuration.grpc.ServerKeepaliveEnforcementPolicy
-	13, // 11: buildbarn.configuration.grpc.ServerConfiguration.tracing:type_name -> buildbarn.configuration.grpc.ServerConfiguration.TracingEntry
-	5,  // 12: buildbarn.configuration.grpc.ServerConfiguration.keepalive_parameters:type_name -> buildbarn.configuration.grpc.ServerKeepaliveParameters
-	15, // 13: buildbarn.configuration.grpc.ServerKeepaliveEnforcementPolicy.min_time:type_name -> google.protobuf.Duration
-	15, // 14: buildbarn.configuration.grpc.ServerKeepaliveParameters.max_connection_idle:type_name -> google.protobuf.Duration
-	15, // 15: buildbarn.configuration.grpc.ServerKeepaliveParameters.max_connection_age:type_name -> google.protobuf.Duration
-	15, // 16: buildbarn.configuration.grpc.ServerKeepaliveParameters.max_connection_age_grace:type_name -> google.protobuf.Duration
-	15, // 17: buildbarn.configuration.grpc.ServerKeepaliveParameters.time:type_name -> google.protobuf.Duration
-	15, // 18: buildbarn.configuration.grpc.ServerKeepaliveParameters.timeout:type_name -> google.protobuf.Duration
-	18, // 19: buildbarn.configuration.grpc.AuthenticationPolicy.allow:type_name -> buildbarn.auth.AuthenticationMetadata
-	7,  // 20: buildbarn.configuration.grpc.AuthenticationPolicy.any:type_name -> buildbarn.configuration.grpc.AnyAuthenticationPolicy
-	8,  // 21: buildbarn.configuration.grpc.AuthenticationPolicy.all:type_name -> buildbarn.configuration.grpc.AllAuthenticationPolicy
-	9,  // 22: buildbarn.configuration.grpc.AuthenticationPolicy.tls_client_certificate:type_name -> buildbarn.configuration.grpc.TLSClientCertificateAuthenticationPolicy
-	19, // 23: buildbarn.configuration.grpc.AuthenticationPolicy.jwt:type_name -> buildbarn.configuration.jwt.AuthorizationHeaderParserConfiguration
-	6,  // 24: buildbarn.configuration.grpc.AnyAuthenticationPolicy.policies:type_name -> buildbarn.configuration.grpc.AuthenticationPolicy
-	6,  // 25: buildbarn.configuration.grpc.AllAuthenticationPolicy.policies:type_name -> buildbarn.configuration.grpc.AuthenticationPolicy
-	10, // 26: buildbarn.configuration.grpc.ClientConfiguration.TracingEntry.value:type_name -> buildbarn.configuration.grpc.TracingMethodConfiguration
-	10, // 27: buildbarn.configuration.grpc.ServerConfiguration.TracingEntry.value:type_name -> buildbarn.configuration.grpc.TracingMethodConfiguration
-	28, // [28:28] is the sub-list for method output_type
-	28, // [28:28] is the sub-list for method input_type
-	28, // [28:28] is the sub-list for extension type_name
-	28, // [28:28] is the sub-list for extension extendee
-	0,  // [0:28] is the sub-list for field type_name
+	15, // 5: buildbarn.configuration.grpc.ClientConfiguration.default_service_config:type_name -> google.protobuf.Struct
+	16, // 6: buildbarn.configuration.grpc.ClientKeepaliveConfiguration.time:type_name -> google.protobuf.Duration
+	16, // 7: buildbarn.configuration.grpc.ClientKeepaliveConfiguration.timeout:type_name -> google.protobuf.Duration
+	17, // 8: buildbarn.configuration.grpc.ClientOAuthConfiguration.google_default_credentials:type_name -> google.protobuf.Empty
+	18, // 9: buildbarn.configuration.grpc.ServerConfiguration.tls:type_name -> buildbarn.configuration.tls.ServerConfiguration
+	6,  // 10: buildbarn.configuration.grpc.ServerConfiguration.authentication_policy:type_name -> buildbarn.configuration.grpc.AuthenticationPolicy
+	4,  // 11: buildbarn.configuration.grpc.ServerConfiguration.keepalive_enforcement_policy:type_name -> buildbarn.configuration.grpc.ServerKeepaliveEnforcementPolicy
+	13, // 12: buildbarn.configuration.grpc.ServerConfiguration.tracing:type_name -> buildbarn.configuration.grpc.ServerConfiguration.TracingEntry
+	5,  // 13: buildbarn.configuration.grpc.ServerConfiguration.keepalive_parameters:type_name -> buildbarn.configuration.grpc.ServerKeepaliveParameters
+	16, // 14: buildbarn.configuration.grpc.ServerKeepaliveEnforcementPolicy.min_time:type_name -> google.protobuf.Duration
+	16, // 15: buildbarn.configuration.grpc.ServerKeepaliveParameters.max_connection_idle:type_name -> google.protobuf.Duration
+	16, // 16: buildbarn.configuration.grpc.ServerKeepaliveParameters.max_connection_age:type_name -> google.protobuf.Duration
+	16, // 17: buildbarn.configuration.grpc.ServerKeepaliveParameters.max_connection_age_grace:type_name -> google.protobuf.Duration
+	16, // 18: buildbarn.configuration.grpc.ServerKeepaliveParameters.time:type_name -> google.protobuf.Duration
+	16, // 19: buildbarn.configuration.grpc.ServerKeepaliveParameters.timeout:type_name -> google.protobuf.Duration
+	19, // 20: buildbarn.configuration.grpc.AuthenticationPolicy.allow:type_name -> buildbarn.auth.AuthenticationMetadata
+	7,  // 21: buildbarn.configuration.grpc.AuthenticationPolicy.any:type_name -> buildbarn.configuration.grpc.AnyAuthenticationPolicy
+	8,  // 22: buildbarn.configuration.grpc.AuthenticationPolicy.all:type_name -> buildbarn.configuration.grpc.AllAuthenticationPolicy
+	9,  // 23: buildbarn.configuration.grpc.AuthenticationPolicy.tls_client_certificate:type_name -> buildbarn.configuration.grpc.TLSClientCertificateAuthenticationPolicy
+	20, // 24: buildbarn.configuration.grpc.AuthenticationPolicy.jwt:type_name -> buildbarn.configuration.jwt.AuthorizationHeaderParserConfiguration
+	6,  // 25: buildbarn.configuration.grpc.AnyAuthenticationPolicy.policies:type_name -> buildbarn.configuration.grpc.AuthenticationPolicy
+	6,  // 26: buildbarn.configuration.grpc.AllAuthenticationPolicy.policies:type_name -> buildbarn.configuration.grpc.AuthenticationPolicy
+	10, // 27: buildbarn.configuration.grpc.ClientConfiguration.TracingEntry.value:type_name -> buildbarn.configuration.grpc.TracingMethodConfiguration
+	10, // 28: buildbarn.configuration.grpc.ServerConfiguration.TracingEntry.value:type_name -> buildbarn.configuration.grpc.TracingMethodConfiguration
+	29, // [29:29] is the sub-list for method output_type
+	29, // [29:29] is the sub-list for method input_type
+	29, // [29:29] is the sub-list for extension type_name
+	29, // [29:29] is the sub-list for extension extendee
+	0,  // [0:29] is the sub-list for field type_name
 }
 
 func init() { file_pkg_proto_configuration_grpc_grpc_proto_init() }
diff --git a/pkg/proto/configuration/grpc/grpc.proto b/pkg/proto/configuration/grpc/grpc.proto
index 66a0b565..fbb8267c 100644
--- a/pkg/proto/configuration/grpc/grpc.proto
+++ b/pkg/proto/configuration/grpc/grpc.proto
@@ -4,6 +4,7 @@ package buildbarn.configuration.grpc;
 
 import "google/protobuf/duration.proto";
 import "google/protobuf/empty.proto";
+import "google/protobuf/struct.proto";
 import "pkg/proto/auth/auth.proto";
 import "pkg/proto/configuration/jwt/jwt.proto";
 import "pkg/proto/configuration/tls/tls.proto";
@@ -118,10 +119,11 @@ message ClientConfiguration {
   // /google.bytestream.ByteStream/Read
   map<string, TracingMethodConfiguration> tracing = 11;
 
-  // The gRPC connection's default service config.  See grpc-go
-  // WithDefaultServiceConfig. Note that the address should use dns:/// schema
-  // when LB config is round-robin.
-  string default_service_config = 13;
+  // The gRPC connection's default service config. Note that the address
+  // should use dns:/// schema when LB config is round-robin.
+  //
+  // More details: https://grpc.io/docs/guides/service-config/
+  google.protobuf.Struct default_service_config = 13;
 }
 
 message ClientKeepaliveConfiguration {