diff --git a/pkg/api/validation/validation_test.go b/pkg/api/validation/validation_test.go
index 47ddb1893a0..ca2ea7de104 100644
--- a/pkg/api/validation/validation_test.go
+++ b/pkg/api/validation/validation_test.go
@@ -28,8 +28,8 @@ import (
 
 func expectPrefix(t *testing.T, prefix string, errs errors.ErrorList) {
 	for i := range errs {
-		if !strings.HasPrefix(errs[i].(errors.ValidationError).Field, prefix) {
-			t.Errorf("expected prefix '%s' for %v", errs[i])
+		if f, p := errs[i].(errors.ValidationError).Field, prefix; !strings.HasPrefix(f, p) {
+			t.Errorf("expected prefix '%s' for field '%s' (%v)", p, f, errs[i])
 		}
 	}
 }