diff --git a/strolch-wc-localize-behavior.html b/strolch-wc-localize-behavior.html
index b42213e..d554b32 100644
--- a/strolch-wc-localize-behavior.html
+++ b/strolch-wc-localize-behavior.html
@@ -15,6 +15,7 @@
 
             // load the language resource of the configured language
             this.language = strolchLocalLanguage;
+            this.useKeyIfMissing = true;
             this.loadResources(strolchLocalResourceUrl);
         }
     };