diff --git a/sys/hashes/sha3.c b/sys/hashes/sha3.c
index 62803dc1c2..313915b68c 100644
--- a/sys/hashes/sha3.c
+++ b/sys/hashes/sha3.c
@@ -424,7 +424,6 @@ void Keccak_update(keccak_state_t *ctx, const unsigned char *input,
 
         if (blockSize == ctx->rateInBytes) {
             KeccakF1600_StatePermute(ctx->state);
-            blockSize = 0;
             ctx->i = 0;
         }
     }