diff --git a/content/base/src/nsDocument.cpp b/content/base/src/nsDocument.cpp
index 4071426dc1f..ff97dbbd12f 100644
--- a/content/base/src/nsDocument.cpp
+++ b/content/base/src/nsDocument.cpp
@@ -346,9 +346,6 @@ nsIdentifierMapEntry::FireChangeCallbacks(Element* aOldElement,
                                           Element* aNewElement,
                                           PRBool aImageOnly)
 {
-  NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
-               "Missing script blockers around code that modifies id-hash");
-
   if (!mChangeCallbacks)
     return;