diff --git a/isisd/isis_redist.c b/isisd/isis_redist.c
index 5311b5c69c..1ce6a925e7 100644
--- a/isisd/isis_redist.c
+++ b/isisd/isis_redist.c
@@ -52,6 +52,7 @@ redist_protocol(int family)
     return 1;
 
   assert(!"Unsupported address family!");
+  return 0;
 }
 
 static int