diff --git a/doc/changelog.txt b/doc/changelog.txt
index 91b17d7..aa07ec5 100644
--- a/doc/changelog.txt
+++ b/doc/changelog.txt
@@ -3,6 +3,7 @@ HEAD
 ====
 Fixes:
 - xt_pknock: avoid crash when hash TFM could not be allocated
+- xt_pknock: avoid inversion of rule lookup that led to warnings
 
 
 v1.33 (2011-02-02)
diff --git a/extensions/pknock/xt_pknock.c b/extensions/pknock/xt_pknock.c
index d7fe379..b6f6802 100644
--- a/extensions/pknock/xt_pknock.c
+++ b/extensions/pknock/xt_pknock.c
@@ -398,19 +398,15 @@ peer_gc(unsigned long r)
 
 /**
  * Compares length and name equality for the rules.
- *
- * @info
- * @rule
- * @return: 0 equals, 1 otherwise
  */
 static inline bool
 rulecmp(const struct xt_pknock_mtinfo *info, const struct xt_pknock_rule *rule)
 {
 	if (info->rule_name_len != rule->rule_name_len)
-		return true;
+		return false;
 	if (strncmp(info->rule_name, rule->rule_name, info->rule_name_len) != 0)
-		return true;
-	return false;
+		return false;
+	return true;
 }
 
 /**