diff --git a/xpcom/base/nsCycleCollector.cpp b/xpcom/base/nsCycleCollector.cpp
index 44f4f460ee18..98a3152b4f8f 100644
--- a/xpcom/base/nsCycleCollector.cpp
+++ b/xpcom/base/nsCycleCollector.cpp
@@ -2280,6 +2280,8 @@ nsCycleCollector::Collect(PRUint32 aTryCollections)
         mWhiteNodes->Clear();
         ClearGraph();
 
+        mParams.mDoNothing = PR_FALSE;
+
         if (!collected)
             break;