diff --git a/kubernetes/validators.go b/kubernetes/validators.go
index 4acc9191ad..2b9da4f81b 100644
--- a/kubernetes/validators.go
+++ b/kubernetes/validators.go
@@ -21,6 +21,10 @@ func validateAnnotations(value interface{}, key string) (ws []string, es []error
 				es = append(es, fmt.Errorf("%s (%q) %s", key, k, e))
 			}
 		}
+
+		if isInternalKey(k) {
+			es = append(es, fmt.Errorf("%s: %q is internal Kubernetes annotation", key, k))
+		}
 	}
 	return
 }