diff --git a/extensions/pknock/libxt_pknock.c b/extensions/pknock/libxt_pknock.c
index 4852e9f..1cd8293 100644
--- a/extensions/pknock/libxt_pknock.c
+++ b/extensions/pknock/libxt_pknock.c
@@ -123,7 +123,7 @@ __pknock_parse(int c, char **argv, int invert, unsigned int *flags,
 		info->ports_count = parse_ports(optarg, info->port, proto);
 		info->option |= XT_PKNOCK_KNOCKPORT;
 		*flags |= XT_PKNOCK_KNOCKPORT;
-#if DEBUG
+#ifdef DEBUG
 		printf("ports_count: %d\n", info->ports_count);
 #endif
 		break;
@@ -162,7 +162,7 @@ __pknock_parse(int c, char **argv, int invert, unsigned int *flags,
 		info->rule_name_len = strlen(info->rule_name);
 		info->option |= XT_PKNOCK_NAME;
 		*flags |= XT_PKNOCK_NAME;
-#if DEBUG
+#ifdef DEBUG
 		printf("info->rule_name: %s\n", info->rule_name);
 #endif
 		break;
diff --git a/extensions/pknock/xt_pknock.h b/extensions/pknock/xt_pknock.h
index d44905b..fb201df 100644
--- a/extensions/pknock/xt_pknock.h
+++ b/extensions/pknock/xt_pknock.h
@@ -29,8 +29,6 @@ enum {
 	XT_PKNOCK_MAX_PASSWD_LEN = 31,
 };
 
-#define DEBUG 1
-
 struct xt_pknock_mtinfo {
 	char rule_name[XT_PKNOCK_MAX_BUF_LEN+1];
 	uint32_t			rule_name_len;