Index: /trunk/src/libs/xpcom18a4/python/src/PyISupports.cpp
===================================================================
--- /trunk/src/libs/xpcom18a4/python/src/PyISupports.cpp	(revision 31146)
+++ /trunk/src/libs/xpcom18a4/python/src/PyISupports.cpp	(revision 31147)
@@ -314,5 +314,7 @@
 #ifdef NS_DEBUG
 		nsISupports *queryResult = nsnull;
+        Py_BEGIN_ALLOW_THREADS;
 		pis->QueryInterface(riid, (void **)&queryResult);
+        Py_END_ALLOW_THREADS;
 		NS_ASSERTION(queryResult == pis, "QueryInterface needed");
 		NS_IF_RELEASE(queryResult);