diff --git a/tests/libtest/lib5000.c b/tests/libtest/lib5000.c
index 05c5b99ac4..511b26c8e4 100644
--- a/tests/libtest/lib5000.c
+++ b/tests/libtest/lib5000.c
@@ -42,7 +42,7 @@ static CURLcode test_lib5000(const char *URL)
   }
 
   easy_setopt(curl, CURLOPT_VERBOSE, 1L);
-  easy_setopt(curl, CURLOPT_HTTPSIG_ALGORITHM, (long)CURLHTTPSIG_ED25519);
+  easy_setopt(curl, CURLOPT_HTTPSIG_ALGORITHM, CURLHTTPSIG_ED25519);
   easy_setopt(curl, CURLOPT_HTTPSIG_KEY,
               "9f8362f87a484a954e6e740c5b4c0e84"
               "229139a20aa8ab56ff66586f6a7d29c5");