diff --git a/nettle-internal.c b/nettle-internal.c
index b1364634ab947a8474947544f4753c2fcbdcac99..52e79b0bc5cf827c2b1a167c8f6bd0dc704a34d3 100644
--- a/nettle-internal.c
+++ b/nettle-internal.c
@@ -78,4 +78,4 @@ nettle_des3 = {
 /* NOTE: This is not as nice as one might think, as it will crash if
  * we try to encrypt something with a weak key. */
 const struct nettle_cipher
-nettle_blowfish128 = _NETTLE_CIPHER(blowfish, BLOWFISH, 16);
+nettle_blowfish128 = _NETTLE_CIPHER(blowfish, BLOWFISH, 128);