diff --git a/ripd/rip_routemap.c b/ripd/rip_routemap.c
index 9d6fd16..cb87ea5 100644
--- a/ripd/rip_routemap.c
+++ b/ripd/rip_routemap.c
@@ -530,7 +530,7 @@
       else if (mod->type == metric_absolute)
 	rinfo->metric_out = mod->metric;
 
-      if (rinfo->metric_out < 1)
+      if ((signed int)rinfo->metric_out < 1)
 	rinfo->metric_out = 1;
       if (rinfo->metric_out > RIP_METRIC_INFINITY)
 	rinfo->metric_out = RIP_METRIC_INFINITY;