diff --git a/src/event.c b/src/event.c
index 009258c..8424fe2 100644
--- a/src/event.c
+++ b/src/event.c
@@ -33,7 +33,10 @@
 #include <errno.h>
 #include "System.h"
 
-#define max(a, b) ((a) >= (b)) ? (a) : (b)
+/* macros */
+#ifndef max
+# define max(a, b) ((a) >= (b)) ? (a) : (b)
+#endif
 
 
 /* Event */