diff --git a/files/www/cgi-bin/setup b/files/www/cgi-bin/setup
index 5065a8b3..e1387f5a 100755
--- a/files/www/cgi-bin/setup
+++ b/files/www/cgi-bin/setup
@@ -85,8 +85,8 @@ if($dmz_mode)
 }
 
 # derive values which are not explicitly defined
-$parms{dhcp_limit} = $dhcp_limit = $dhcp_end - $dhcp_start;
-$parms{dmz_dhcp_limit} = $dmz_dhcp_limit = $dmz_dhcp_end - $dmz_dhcp_start;
+$parms{dhcp_limit} = $dhcp_limit = $dhcp_end - $dhcp_start + 1;
+$parms{dmz_dhcp_limit} = $dmz_dhcp_limit = $dmz_dhcp_end - $dmz_dhcp_start + 1;
 
 #
 # get the active wifi settings on a fresh page load