diff --git a/plugins/snmp/snmp__if_combined b/plugins/snmp/snmp__if_combined
index f573b35e..f449f545 100755
--- a/plugins/snmp/snmp__if_combined
+++ b/plugins/snmp/snmp__if_combined
@@ -613,8 +613,10 @@ END
       print <<END;
 recv$if.label $alias
 recv$if.graph no
+recv$if.cdef recv$if,8,*
 send$if.label $alias
 send$if.negative recv$if
+send$if.cdef send$if,8,*
 END
     }
 }