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-rw-r--r--src/basic/missing_timerfd.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/basic/missing_timerfd.h b/src/basic/missing_timerfd.h
index dba3043..a01a4ec 100644
--- a/src/basic/missing_timerfd.h
+++ b/src/basic/missing_timerfd.h
@@ -3,6 +3,10 @@
#include <sys/timerfd.h>
+#include "macro.h"
+
#ifndef TFD_TIMER_CANCEL_ON_SET
-#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
+# define TFD_TIMER_CANCEL_ON_SET (1 << 1)
+#else
+assert_cc(TFD_TIMER_CANCEL_ON_SET == (1 << 1));
#endif