diff --git a/grpc/testdata/wrappers_testing/service.go b/grpc/testdata/wrappers_testing/service.go
index ed44777..52e38e0 100644
--- a/grpc/testdata/wrappers_testing/service.go
+++ b/grpc/testdata/wrappers_testing/service.go
@@ -53,7 +53,7 @@ func (s *service) TestBoolean(ctx context.Context, in *wrappers.BoolValue) (*wra
 }
 
 func (s *service) TestDouble(ctx context.Context, in *wrappers.DoubleValue) (*wrappers.DoubleValue, error) {
-	if s.TestBooleanImplementation != nil {
+	if s.TestDoubleImplementation != nil {
 		return s.TestDoubleImplementation(ctx, in)
 	}