diff --git a/crypto/ahash.c b/crypto/ahash.c
index cc824ef2..1576f95 100644
--- a/crypto/ahash.c
+++ b/crypto/ahash.c
@@ -152,8 +152,7 @@
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
 	ret = ahash->setkey(tfm, alignbuffer, keylen);
-	memset(alignbuffer, 0, keylen);
-	kfree(buffer);
+	kzfree(buffer);
 	return ret;
 }