diff --git a/js/modules/k6/grpc/client.go b/js/modules/k6/grpc/client.go
index 1a9538a7df4..429ed00020a 100644
--- a/js/modules/k6/grpc/client.go
+++ b/js/modules/k6/grpc/client.go
@@ -295,8 +295,16 @@ func (c *Client) convertToMethodInfo(fdset *descriptorpb.FileDescriptorSet) ([]M
 			}
 		}
 		messages := fd.Messages()
+
+		stack := make([]protoreflect.MessageDescriptor, 0, messages.Len())
 		for i := 0; i < messages.Len(); i++ {
-			message := messages.Get(i)
+			stack = append(stack, messages.Get(i))
+		}
+
+		for len(stack) > 0 {
+			message := stack[len(stack)-1]
+			stack = stack[:len(stack)-1]
+
 			_, errFind := protoregistry.GlobalTypes.FindMessageByName(message.FullName())
 			if errors.Is(errFind, protoregistry.NotFound) {
 				err = protoregistry.GlobalTypes.RegisterMessage(dynamicpb.NewMessageType(message))
@@ -304,7 +312,13 @@ func (c *Client) convertToMethodInfo(fdset *descriptorpb.FileDescriptorSet) ([]M
 					return false
 				}
 			}
+
+			nested := message.Messages()
+			for i := 0; i < nested.Len(); i++ {
+				stack = append(stack, nested.Get(i))
+			}
 		}
+
 		return true
 	})
 	if err != nil {
diff --git a/js/modules/k6/grpc/client_test.go b/js/modules/k6/grpc/client_test.go
index e19e65d6527..57ccce6b148 100644
--- a/js/modules/k6/grpc/client_test.go
+++ b/js/modules/k6/grpc/client_test.go
@@ -13,6 +13,8 @@ import (
 	"testing"
 
 	"google.golang.org/grpc/reflection"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
 
 	"github.com/dop251/goja"
 	"github.com/golang/protobuf/ptypes/any"
@@ -977,3 +979,64 @@ func TestClientInvokeHeadersDeprecated(t *testing.T) {
 	require.Len(t, entries, 1)
 	require.Contains(t, entries[0].Message, "headers property is deprecated")
 }
+
+func TestClientLoadProto(t *testing.T) {
+	t.Parallel()
+
+	type testState struct {
+		*modulestest.Runtime
+		httpBin *httpmultibin.HTTPMultiBin
+		samples chan metrics.SampleContainer
+	}
+	setup := func(t *testing.T) testState {
+		t.Helper()
+
+		tb := httpmultibin.NewHTTPMultiBin(t)
+		samples := make(chan metrics.SampleContainer, 1000)
+		testRuntime := modulestest.NewRuntime(t)
+
+		cwd, err := os.Getwd() //nolint:forbidigo
+		require.NoError(t, err)
+		fs := fsext.NewOsFs()
+		if isWindows {
+			fs = fsext.NewTrimFilePathSeparatorFs(fs)
+		}
+		testRuntime.VU.InitEnvField.CWD = &url.URL{Path: cwd}
+		testRuntime.VU.InitEnvField.FileSystems = map[string]fsext.Fs{"file": fs}
+
+		return testState{
+			Runtime: testRuntime,
+			httpBin: tb,
+			samples: samples,
+		}
+	}
+
+	ts := setup(t)
+
+	m, ok := New().NewModuleInstance(ts.VU).(*ModuleInstance)
+	require.True(t, ok)
+	require.NoError(t, ts.VU.Runtime().Set("grpc", m.Exports().Named))
+
+	code := `
+		var client = new grpc.Client();
+		client.load([], "../../../../lib/testutils/httpmultibin/grpc_testing/nested_types.proto");`
+
+	_, err := ts.VU.Runtime().RunString(ts.httpBin.Replacer.Replace(code))
+	assert.Nil(t, err, "It was not expected that there would be an error, but it got: %v", err)
+
+	expectedTypes := []string{
+		"grpc.testing.Outer",
+		"grpc.testing.Outer.MiddleAA",
+		"grpc.testing.Outer.MiddleAA.Inner",
+		"grpc.testing.Outer.MiddleBB",
+		"grpc.testing.Outer.MiddleBB.Inner",
+		"grpc.testing.MeldOuter",
+	}
+
+	for _, expected := range expectedTypes {
+		found, err := protoregistry.GlobalTypes.FindMessageByName(protoreflect.FullName(expected))
+
+		assert.NotNil(t, found, "Expected to find the message type %s, but an error occurred", expected)
+		assert.Nil(t, err, "It was not expected that there would be an error, but it got: %v", err)
+	}
+}
diff --git a/lib/testutils/httpmultibin/grpc_testing/nested_types.proto b/lib/testutils/httpmultibin/grpc_testing/nested_types.proto
new file mode 100644
index 00000000000..26eaac904d6
--- /dev/null
+++ b/lib/testutils/httpmultibin/grpc_testing/nested_types.proto
@@ -0,0 +1,36 @@
+// The purpose of this proto file is to demonstrate that we can have
+// nested types and that we should be able to load them correctly.
+
+syntax = "proto3";
+
+package grpc.testing;
+
+// Example to demonstrate that it is possible to define
+// and use message types within other message types
+message Outer {      // Level 0
+  message MiddleAA { // Level 1
+    message Inner {  // Level 2
+      int64 ival = 1;
+      bool booly = 2;
+    }
+    Inner inner = 1;
+  }
+
+  message MiddleBB { // Level 1
+    message Inner {  // Level 2
+      int32 ival = 1;
+      bool booly = 2;
+    }
+    Inner inner = 1;
+  }
+
+  MiddleAA middleAA = 1;
+  MiddleBB middleBB = 2;
+}
+
+// Example to demonstrate that it is possible to reuse
+// a message type outside its parent message type
+message MeldOuter {
+  Outer.MiddleAA.Inner innerAA = 1;
+  Outer.MiddleBB.Inner innerBB = 2;
+}