diff --git a/configure.ac b/configure.ac
index 0c0dda7..b759481 100644
--- a/configure.ac
+++ b/configure.ac
@@ -61,7 +61,7 @@ if test -n "$kbuilddir"; then
 			echo "WARNING: That kernel version is not officially supported yet. Continue at own luck.";
 		elif test "$kmajor" -eq 4 -a "$kminor" -le 10; then
 			:;
-		elif test "$kmajor" -eq 3 -a "$kminor" -ge 14; then
+		elif test "$kmajor" -eq 3 -a "$kminor" -ge 15; then
 			:;
 		else
 			echo "WARNING: That kernel version is not officially supported.";
diff --git a/doc/changelog.txt b/doc/changelog.txt
index 6dd1b08..7b8fe58 100644
--- a/doc/changelog.txt
+++ b/doc/changelog.txt
@@ -4,7 +4,7 @@ HEAD
 Enhancements:
 - support for Linux up to 4.15
 Changes:
-- remove support for Linux 3.7--3.13
+- remove support for Linux 3.7--3.14
 
 
 v2.14 (2017-11-22)
diff --git a/extensions/compat_xtables.h b/extensions/compat_xtables.h
index a5e8ce3..92bedff 100644
--- a/extensions/compat_xtables.h
+++ b/extensions/compat_xtables.h
@@ -8,8 +8,8 @@
 
 #define DEBUGP Use__pr_debug__instead
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0)
-#	warning Kernels below 3.14 not supported.
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
+#	warning Kernels below 3.15 not supported.
 #endif
 
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
diff --git a/extensions/pknock/xt_pknock.c b/extensions/pknock/xt_pknock.c
index 3f47d9b..7be0345 100644
--- a/extensions/pknock/xt_pknock.c
+++ b/extensions/pknock/xt_pknock.c
@@ -710,13 +710,7 @@ msg_to_userspace_nl(const struct xt_pknock_mtinfo *info,
 	scnprintf(msg.rule_name, info->rule_name_len + 1, info->rule_name);
 
 	memcpy(m + 1, &msg, m->len);
-
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
 	cn_netlink_send(m, 0, multicast_group, GFP_ATOMIC);
-#else
-	cn_netlink_send(m, multicast_group, GFP_ATOMIC);
-#endif
-
 	kfree(m);
 #endif
 	return true;