diff --git a/uui/source/iahndl.cxx b/uui/source/iahndl.cxx
index 2a029de54296..291d3f18e844 100644
--- a/uui/source/iahndl.cxx
+++ b/uui/source/iahndl.cxx
@@ -889,6 +889,7 @@ executeMessageBox(
             aResult = DialogMask::ButtonsNo;
             break;
         default:
+            SAL_WARN("uui", "executeMessageBox: nMessResult is " << nMessResult);
             assert(false);
     }