diff --git a/gui/cppchecklibrarydata.h b/gui/cppchecklibrarydata.h
index d3426b91c..ae54f230f 100644
--- a/gui/cppchecklibrarydata.h
+++ b/gui/cppchecklibrarydata.h
@@ -152,6 +152,7 @@ public:
     };
 
     void clear() {
+        containers.clear();
         defines.clear();
         functions.clear();
         memoryresource.clear();