diff --git a/lib/otp/otp.c b/lib/otp/otp.c
index 8a512aef6..cf6d7a71b 100644
--- a/lib/otp/otp.c
+++ b/lib/otp/otp.c
@@ -47,7 +47,7 @@ RCSID("$Id$");
 static OtpAlgorithm algorithms[] = {
   {OTP_ALG_MD4, "md4", 16, otp_md4_hash, otp_md4_init, otp_md4_next},
   {OTP_ALG_MD5, "md5", 16, otp_md5_hash, otp_md5_init, otp_md5_next},
-  {OTP_ALG_SHA, "sha", 16, otp_sha_hash, otp_sha_init, otp_sha_next}
+  {OTP_ALG_SHA, "sha", 20, otp_sha_hash, otp_sha_init, otp_sha_next}
 };
 
 OtpAlgorithm *