diff --git a/library/pkcs5.c b/library/pkcs5.c
index 0b9830d..c2aa06d 100644
--- a/library/pkcs5.c
+++ b/library/pkcs5.c
@@ -184,7 +184,7 @@
     if( ( ret = cipher_init_ctx( &cipher_ctx, cipher_info ) ) != 0 )
         goto exit;
 
-    if( ( ret = cipher_setkey( &cipher_ctx, key, keylen, mode ) ) != 0 )
+    if( ( ret = cipher_setkey( &cipher_ctx, key, 8 * keylen, mode ) ) != 0 )
         goto exit;
 
     if( ( ret = cipher_set_iv( &cipher_ctx, iv, enc_scheme_params.len ) ) != 0 )