diff --git a/include/linux/netfilter/x_tables.h
b/include/linux/netfilter/x_tables.h
index 8d674a7..24b4dd4 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -4,7 +4,7 @@
 #include <linux/types.h>
 
 #define XT_FUNCTION_MAXNAMELEN 30
-#define XT_EXTENSION_MAXNAMELEN 29
+#define XT_EXTENSION_MAXNAMELEN 32
 #define XT_TABLE_MAXNAMELEN 32
 
 struct xt_entry_match {