diff --git a/src/bench_sign.c b/src/bench_sign.c
index d705f7c0f2a..dd37d8b5401 100644
--- a/src/bench_sign.c
+++ b/src/bench_sign.c
@@ -27,8 +27,8 @@ static void bench_sign(void* arg) {
     bench_sign_t *data = (bench_sign_t*)arg;
 
     unsigned char sig[74];
-    int siglen = 74;
     for (i = 0; i < 20000; i++) {
+        int siglen = 74;
         int j;
         secp256k1_ecdsa_signature_t signature;
         CHECK(secp256k1_ecdsa_sign(data->ctx, data->msg, &signature, data->key, NULL, NULL));