diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c
index 40a3dcf..7755834 100644
--- a/crypto/blkcipher.c
+++ b/crypto/blkcipher.c
@@ -352,7 +352,7 @@
 	alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
 	memcpy(alignbuffer, key, keylen);
 	ret = cipher->setkey(tfm, alignbuffer, keylen);
-	memset(alignbuffer, 0, absize);
+	memset(alignbuffer, 0, keylen);
 	kfree(buffer);
 	return ret;
 }