diff --git a/content/xul/content/src/nsXULAttributes.h b/content/xul/content/src/nsXULAttributes.h
index b83e04bae20a..269fc9d1002f 100644
--- a/content/xul/content/src/nsXULAttributes.h
+++ b/content/xul/content/src/nsXULAttributes.h
@@ -54,7 +54,7 @@ struct nsClassList {
   }
   ~nsClassList(void)
   {
-    NS_RELEASE(mAtom);
+    NS_IF_RELEASE(mAtom);
     if (nsnull != mNext) {
       delete mNext;
     }
diff --git a/rdf/content/src/nsXULAttributes.h b/rdf/content/src/nsXULAttributes.h
index b83e04bae20a..269fc9d1002f 100644
--- a/rdf/content/src/nsXULAttributes.h
+++ b/rdf/content/src/nsXULAttributes.h
@@ -54,7 +54,7 @@ struct nsClassList {
   }
   ~nsClassList(void)
   {
-    NS_RELEASE(mAtom);
+    NS_IF_RELEASE(mAtom);
     if (nsnull != mNext) {
       delete mNext;
     }