diff --git a/netwerk/protocol/http/nsHttpConnection.cpp b/netwerk/protocol/http/nsHttpConnection.cpp
index 3769d7193073..76eadd72cf25 100644
--- a/netwerk/protocol/http/nsHttpConnection.cpp
+++ b/netwerk/protocol/http/nsHttpConnection.cpp
@@ -150,6 +150,18 @@ nsHttpConnection::Activate(nsAHttpTransaction *trans, PRUint8 caps)
     NS_ENSURE_ARG_POINTER(trans);
     NS_ENSURE_TRUE(!mTransaction, NS_ERROR_IN_PROGRESS);
 
+    // Update security callbacks
+    nsCOMPtr<nsIInterfaceRequestor> callbacks;
+    nsCOMPtr<nsIEventTarget>        callbackTarget;
+    trans->GetSecurityCallbacks(getter_AddRefs(callbacks),
+                                getter_AddRefs(callbackTarget));
+    if (callbacks != mCallbacks) {
+        mCallbacks.swap(callbacks);
+        if (callbacks)
+            NS_ProxyRelease(mCallbackTarget, callbacks);
+        mCallbackTarget = callbackTarget;
+    }
+
     // take ownership of the transaction
     mTransaction = trans;