diff --git a/packages/core/lib/translate.directive.ts b/packages/core/lib/translate.directive.ts
index 5e859ff..fdd253d 100644
--- a/packages/core/lib/translate.directive.ts
+++ b/packages/core/lib/translate.directive.ts
@@ -111,7 +111,7 @@ export class TranslateDirective implements AfterViewChecked, OnDestroy {
       this.lastParams = this.currentParams;
 
       let onTranslation = (res: unknown) => {
-        if (res !== key) {
+        if (res !== key || !node.lastKey) {
           node.lastKey = key;
         }
         if (!node.originalContent) {