diff --git a/plugins/snmp/snmp__if_combined b/plugins/snmp/snmp__if_combined
index 10dfad6c..c90aed33 100755
--- a/plugins/snmp/snmp__if_combined
+++ b/plugins/snmp/snmp__if_combined
@@ -760,8 +760,8 @@ END
 	return;
     }
 
-    $errors = $snmpinfo->{$if}->{ifInErrors};
-    $discards = $snmpinfo->{$if}->{ifInDiscards};
+    my $errors = $snmpinfo->{$if}->{ifInErrors};
+    my $discards = $snmpinfo->{$if}->{ifInDiscards};
     printf("errors_in %s\n".
 	   "discards_in %s\n".
 	   "total_in %s\n",