Index: generic/include/ipc/ipc.h
===================================================================
--- generic/include/ipc/ipc.h	(revision 5f62ef99a9c5aa3020510303c82ab8fcbfa0b83b)
+++ generic/include/ipc/ipc.h	(revision 3b05862f7b2d26301add7f960fdd87e9c37d6392)
@@ -84,4 +84,5 @@
 	answerbox_t *callerbox;
 	int flags;
+	task_t *sender;
 	__native data[IPC_CALL_LEN];
 } call_t;