Index: uspace/lib/libc/generic/async.c
===================================================================
--- uspace/lib/libc/generic/async.c	(revision eda925ad3905a0c8e5cc3f1d3908e5bb1d14bcae)
+++ uspace/lib/libc/generic/async.c	(revision eb73a50a7c9c0264e01ac6afa6c37410632d035f)
@@ -1310,4 +1310,5 @@
 	    IPC_FF_ROUTE_FROM_ME);
 	if (retval != EOK) {
+		async_wait_for(msg, NULL);
 		ipc_answer_0(callid, retval);
 		return retval;
@@ -1495,4 +1496,5 @@
 	    IPC_FF_ROUTE_FROM_ME);
 	if (retval != EOK) {
+		async_wait_for(msg, NULL);
 		ipc_answer_0(callid, retval);
 		return retval;