diff --git a/xpfe/appshell/src/nsDialogParamBlock.cpp b/xpfe/appshell/src/nsDialogParamBlock.cpp
index 14533052295..f900d7fc71d 100644
--- a/xpfe/appshell/src/nsDialogParamBlock.cpp
+++ b/xpfe/appshell/src/nsDialogParamBlock.cpp
@@ -73,6 +73,7 @@ NS_IMETHODIMP nsDialogParamBlock::SetNumberStrings( PRInt32 inNumStrings )
 	 if ( !mString )
 	 	return NS_ERROR_OUT_OF_MEMORY;
 	 mNumStrings = inNumStrings;
+         return NS_OK;
 }