diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index d07b0c1..7ed3e4a 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -444,7 +444,7 @@
 	}
 
 	ahp->icv_full_len = aalg_desc->uinfo.auth.icv_fullbits/8;
-	ahp->icv_trunc_len = aalg_desc->uinfo.auth.icv_truncbits/8;
+	ahp->icv_trunc_len = x->aalg->alg_trunc_len/8;
 
 	BUG_ON(ahp->icv_trunc_len > MAX_AH_AUTH_LEN);