diff --git a/appveyor.yml b/appveyor.yml
index 8567dd80fe9..055231834a1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,7 +9,7 @@ clone_folder: c:\projects\gqlgen
 
 environment:
   GOPATH: c:\gopath
-  GOVERSION: 1.11.5
+  GOVERSION: 1.13.7
   PATH: '%PATH%;c:\gopath\bin'
 
 init:
diff --git a/codegen/config/config_test.go b/codegen/config/config_test.go
index 9f0e0a32494..2cb15becc23 100644
--- a/codegen/config/config_test.go
+++ b/codegen/config/config_test.go
@@ -46,7 +46,7 @@ func TestLoadConfig(t *testing.T) {
 	t.Run("unwalkable path", func(t *testing.T) {
 		_, err := LoadConfig("testdata/cfg/unwalkable.yml")
 		if runtime.GOOS == "windows" {
-			require.EqualError(t, err, "failed to walk schema at root not_walkable/: FindFirstFile not_walkable/: The parameter is incorrect.")
+			require.EqualError(t, err, "failed to walk schema at root not_walkable/: CreateFile not_walkable/: The system cannot find the file specified.")
 		} else {
 			require.EqualError(t, err, "failed to walk schema at root not_walkable/: lstat not_walkable/: no such file or directory")
 		}