diff --git a/extensions/compat_xtables.c b/extensions/compat_xtables.c
index 8514af8..9e96c0d 100644
--- a/extensions/compat_xtables.c
+++ b/extensions/compat_xtables.c
@@ -105,7 +105,11 @@ static bool xtnu_match_check(const char *table, const void *entry,
 		return false;
 	if (nm->checkentry == NULL)
 		return true;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23)
 	return nm->checkentry(&local_par);
+#else
+	return nm->checkentry(&local_par) == 0;
+#endif
 }
 #endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28) && \
@@ -118,7 +122,7 @@ static bool xtnu_match_check(const struct xt_mtchk_param *par)
 		return false;
 	if (nm->checkentry == NULL)
 		return true;
-	return nm->checkentry(par) == 0 ? true : false;
+	return nm->checkentry(par) == 0;
 }
 #endif
 
@@ -313,7 +317,11 @@ static bool xtnu_target_check(const char *table, const void *entry,
 	if (nt->checkentry == NULL)
 		/* this is valid, just like if there was no function */
 		return true;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23)
 	return nt->checkentry(&local_par);
+#else
+	return nt->checkentry(&local_par) == 0;
+#endif
 }
 #endif
 
@@ -327,7 +335,7 @@ static bool xtnu_target_check(const struct xt_tgchk_param *par)
 		return false;
 	if (nt->checkentry == NULL)
 		return true;
-	return nt->checkentry(par) == 0 ? true : false;
+	return nt->checkentry(par) == 0;
 }
 #endif