diff --git a/dom/html/nsDOMStringMap.cpp b/dom/html/nsDOMStringMap.cpp
index afe1cd69f16d..7b9eb00ddc9f 100644
--- a/dom/html/nsDOMStringMap.cpp
+++ b/dom/html/nsDOMStringMap.cpp
@@ -126,11 +126,13 @@ nsDOMStringMap::NamedDeleter(const nsAString& aProp, bool& found)
 {
   // Currently removing property, attribute is already removed.
   if (mRemovingProp) {
+    found = false;
     return;
   }
   
   nsAutoString attr;
   if (!DataPropToAttr(aProp, attr)) {
+    found = false;
     return;
   }