diff --git a/xtrn/sdk/xsdk.c b/xtrn/sdk/xsdk.c
index 1da8bbd36f21c0abc5bfeb1a0990d695544b0659..8d3b01c0313b88c6a64adb30078abae497939e13 100644
--- a/xtrn/sdk/xsdk.c
+++ b/xtrn/sdk/xsdk.c
@@ -1889,6 +1889,8 @@ void initdata(void)
 			printf("\r\n\7Error %d creating output_event\r\n",GetLastError());
 			exit(1);
 		}
+#else
+		sem_init(&output_sem,0,0);
 #endif
 		_beginthread(output_thread,0,NULL);
 	}