1 files changed, 1 insertions, 1 deletions

diff --git a/libbus.c b/libbus.c
index 0a84353..5abb4e5 100644
--- a/libbus.c
+++ b/libbus.c
@@ -196,7 +196,7 @@
 
 
 
-#ifdef _SEM_SEMUN_UNDEFINED
+#ifndef SEMUN_ALREADY_DEFINED
 union semun {
 	int val;
 	struct semid_ds *buf;