diff --git a/netwerk/protocol/http/src/nsHttpTransaction.cpp b/netwerk/protocol/http/src/nsHttpTransaction.cpp
index 9d574198681..d3f0ccae8c8 100644
--- a/netwerk/protocol/http/src/nsHttpTransaction.cpp
+++ b/netwerk/protocol/http/src/nsHttpTransaction.cpp
@@ -283,6 +283,7 @@ nsHttpTransaction::OnTransportStatus(nsresult status, PRUint32 progress)
         }
 
         postEvent = !mTransportStatusInProgress;
+        mTransportStatusInProgress = PR_TRUE;
     }
 
     // only post an event if there is not already an event in progress.  we