diff --git a/src/ipc/semtimedop.c b/src/ipc/semtimedop.c
index a3b511b6810e510f9751d618a11627bae4a05d11..b0c4cf9f82a79cd8b532c19246d7b315fac91b3e 100644
--- a/src/ipc/semtimedop.c
+++ b/src/ipc/semtimedop.c
@@ -5,7 +5,7 @@
 
 int semtimedop(int id, struct sembuf *buf, size_t n, const struct timespec *ts)
 {
-#ifdef SYS_semop
+#ifdef SYS_semtimedop
 	return syscall(SYS_semtimedop, id, buf, n, ts);
 #else
 	return syscall(SYS_ipc, IPCOP_semtimedop, id, n, 0, buf, ts);