diff --git a/src/openvpn/syshead.h b/src/openvpn/syshead.h
index b14214dd..4db29cc3 100644
--- a/src/openvpn/syshead.h
+++ b/src/openvpn/syshead.h
@@ -398,6 +398,13 @@
 #define HAVE_GETTIMEOFDAY_NANOSECONDS 1
 #endif
 
+/*
+ * do we have the MIN() macro?
+ */
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
 /*
  * Do we have the capability to report extended socket errors?
  */