diff --git a/include/net/ah.h b/include/net/ah.h
index f0129f7..be7798d 100644
--- a/include/net/ah.h
+++ b/include/net/ah.h
@@ -4,7 +4,7 @@
 #include <linux/skbuff.h>
 
 /* This is the maximum truncated ICV length that we know of. */
-#define MAX_AH_AUTH_LEN	12
+#define MAX_AH_AUTH_LEN	16
 
 struct crypto_ahash;