diff --git a/service/interpreter/utils.go b/service/interpreter/utils.go
index 73b8b54b..3782e5f6 100644
--- a/service/interpreter/utils.go
+++ b/service/interpreter/utils.go
@@ -2,10 +2,10 @@ package interpreter
 
 import (
 	"fmt"
-	"go.temporal.io/sdk/workflow"
 	"golang.org/x/exp/constraints"
 	"path/filepath"
 	"runtime"
+	"slices"
 )
 
 func caller(skip int) string {
@@ -23,7 +23,12 @@ func LastCaller() string {
 // DeterministicKeys returns the keys of a map in deterministic (sorted) order. To be used in for
 // loops in workflows for deterministic iteration.
 func DeterministicKeys[K constraints.Ordered, V any](m map[K]V) []K {
-	// see https://github.com/temporalio/sdk-go/blob/7828e06cf517dd2d27881a33efaaf4ff985f2e14/workflow/workflow.go#L787
+	// copy from https://github.com/temporalio/sdk-go/blob/7828e06cf517dd2d27881a33efaaf4ff985f2e14/workflow/workflow.go#L787
 	// and example usage https://github.com/temporalio/samples-go/blob/c69dc0bacc78163a50465c6f80aa678739673a4d/safe_message_handler/workflow.go#L119
-	return workflow.DeterministicKeys(m)
+	r := make([]K, 0, len(m))
+	for k := range m {
+		r = append(r, k)
+	}
+	slices.Sort(r)
+	return r
 }