diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 64165edb00..3a062c9203 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -7919,7 +7919,9 @@ static void *iax2_process_thread(void *data)
 		case IAX_IOSTATE_SCHEDREADY:
 			thread->actions++;
 			thread->iostate = IAX_IOSTATE_PROCESSING;
+#ifdef SCHED_MULTITHREAD
 			thread->schedfunc(thread->scheddata);
+#endif		
 			break;
 		}
 		time(&thread->checktime);