diff --git a/src/crypto/keccak.c b/src/crypto/keccak.c
index 7386d37a3..533021af3 100644
--- a/src/crypto/keccak.c
+++ b/src/crypto/keccak.c
@@ -81,7 +81,8 @@ void keccak(const uint8_t *in, size_t inlen, uint8_t *md, int mdlen)
     uint8_t temp[144];
     size_t i, rsiz, rsizw;
 
-    if (mdlen <= 0 || mdlen > 200 || sizeof(st) != 200)
+    static_assert(HASH_DATA_AREA <= sizeof(temp), "Bad keccak preconditions");
+    if (mdlen <= 0 || (mdlen > 100 && sizeof(st) != (size_t)mdlen))
     {
       fprintf(stderr, "Bad keccak use");
       abort();