diff --git a/pkg/jsonconfig/jsonconfig_test.go b/pkg/jsonconfig/jsonconfig_test.go
index 89e5c9e2c..b50658424 100644
--- a/pkg/jsonconfig/jsonconfig_test.go
+++ b/pkg/jsonconfig/jsonconfig_test.go
@@ -42,7 +42,7 @@ func TestIncludeLoop(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected an error about import cycles.")
 	}
-	if !strings.Contains(err.String(), "include cycle detected"){
+	if !strings.Contains(err.Error(), "include cycle detected"){
 		t.Fatal("expected an error about import cycles; got: %v", err)
 	}
 }