diff --git a/test/acvp_test.c b/test/acvp_test.c
index 0e2d54dab6..10621c3e48 100644
--- a/test/acvp_test.c
+++ b/test/acvp_test.c
@@ -94,6 +94,7 @@ static int sig_gen(EVP_PKEY *pkey, OSSL_PARAM *params, const char *digest_name,
     size_t sig_len;
     size_t sz = EVP_PKEY_get_size(pkey);
 
+    sig_len = sz;
     if (!TEST_ptr(sig = OPENSSL_malloc(sz))
         || !TEST_ptr(md_ctx = EVP_MD_CTX_new())
         || !TEST_int_eq(EVP_DigestSignInit_ex(md_ctx, NULL, digest_name, libctx,