diff --git a/src/igmpproxy.h b/src/igmpproxy.h
index ad1063be..39d5a499 100644
--- a/src/igmpproxy.h
+++ b/src/igmpproxy.h
@@ -113,7 +113,7 @@ void my_log( int Serverity, int Errno, const char *FmtSt, ... );
 
 /* ifvc.c
  */
-#define MAX_IF         40     // max. number of interfaces recognized
+#define MAX_IF         100     // max. number of interfaces recognized
 
 // Interface states
 #define IF_STATE_DISABLED      0   // Interface should be ignored.