diff --git a/lib/neo4ex/bolt_protocol/structure.ex b/lib/neo4ex/bolt_protocol/structure.ex
index 7443266..ad55571 100644
--- a/lib/neo4ex/bolt_protocol/structure.ex
+++ b/lib/neo4ex/bolt_protocol/structure.ex
@@ -153,6 +153,11 @@ defmodule Neo4ex.BoltProtocol.Structure do
 
   # embedded structure must be a map but we should take advantage of field versioning
   defp embedded_encoder_protocol(fields_list) do
+    # When default values contain some data from module (like values from attributes) it won't be visible inside defimpl (different module)
+    # For protocol we need only version so this is completely fine
+    fields_list =
+      Enum.map(fields_list, fn {field, opts} -> {field, [version: opts[:version]]} end)
+
     quote location: :keep do
       defimpl Neo4ex.BoltProtocol.Encoder do
         def encode(struct, bolt_version) do
@@ -170,6 +175,11 @@ defmodule Neo4ex.BoltProtocol.Structure do
   end
 
   defp encoder_protocol(fields_list) do
+    # When default values contain some data from module (like values from attributes) it won't be visible inside defimpl (different module)
+    # For protocol we need only version so this is completely fine
+    fields_list =
+      Enum.map(fields_list, fn {field, opts} -> {field, [version: opts[:version]]} end)
+
     quote location: :keep do
       defimpl Neo4ex.BoltProtocol.Encoder do
         alias Neo4ex.PackStream.{Markers, Exceptions}
diff --git a/lib/neo4ex/bolt_protocol/structure/message/extra/hello.ex b/lib/neo4ex/bolt_protocol/structure/message/extra/hello.ex
index 65cf2f8..36fb87a 100644
--- a/lib/neo4ex/bolt_protocol/structure/message/extra/hello.ex
+++ b/lib/neo4ex/bolt_protocol/structure/message/extra/hello.ex
@@ -2,7 +2,6 @@ defmodule Neo4ex.BoltProtocol.Structure.Message.Extra.Hello do
   use Neo4ex.BoltProtocol.Structure
 
   @version Mix.Project.config()[:version]
-  @system_info System.build_info()[:version]
 
   # can't be encoded directly, it's just helper for the Hello message
   embeded_structure do
@@ -11,7 +10,7 @@ defmodule Neo4ex.BoltProtocol.Structure.Message.Extra.Hello do
     field(:bolt_agent,
       default: %{
         product: "Neo4ex/#{@version}",
-        language: "Elixir/#{@system_info}"
+        language: "Elixir/#{System.build_info()[:version]}"
       },
       version: ">= 5.3.0"
     )