diff --git a/centreon-plugins/src/check_centreon_snmp_process b/centreon-plugins/src/check_centreon_snmp_process
index f412fe67e..37cd6623d 100644
--- a/centreon-plugins/src/check_centreon_snmp_process
+++ b/centreon-plugins/src/check_centreon_snmp_process
@@ -83,7 +83,7 @@ if (!$opt_H) {
 	exit $ERRORS{'OK'};
 }
 
-if ($opt_n && !$opt_c || !$opt_w) {
+if ($opt_n && (!$opt_c || !$opt_w)) {
 	print_usage();
 	exit $ERRORS{'OK'};
 }