diff --git a/pkg/master/import_known_versions_test.go b/pkg/master/import_known_versions_test.go
index c2aba14015f..0d19a47b29a 100644
--- a/pkg/master/import_known_versions_test.go
+++ b/pkg/master/import_known_versions_test.go
@@ -93,6 +93,10 @@ func ensureNoTags(t *testing.T, gvk schema.GroupVersionKind, tp reflect.Type, pa
 		return
 	}
 
+	// Don't look at the same type multiple times
+	if containsType(parents, tp) {
+		return
+	}
 	parents = append(parents, tp)
 
 	switch tp.Kind() {
@@ -145,6 +149,10 @@ func ensureTags(t *testing.T, gvk schema.GroupVersionKind, tp reflect.Type, pare
 		return
 	}
 
+	// Don't look at the same type multiple times
+	if containsType(parents, tp) {
+		return
+	}
 	parents = append(parents, tp)
 
 	switch tp.Kind() {
@@ -185,3 +193,13 @@ func ensureTags(t *testing.T, gvk schema.GroupVersionKind, tp reflect.Type, pare
 		}
 	}
 }
+
+// containsType returns true if s contains t, false otherwise
+func containsType(s []reflect.Type, t reflect.Type) bool {
+	for _, u := range s {
+		if t == u {
+			return true
+		}
+	}
+	return false
+}