diff --git a/tests/libtest/lib1568.c b/tests/libtest/lib1568.c
index 7a402a0293..eb8d31e926 100644
--- a/tests/libtest/lib1568.c
+++ b/tests/libtest/lib1568.c
@@ -37,7 +37,7 @@ static CURLcode test_lib1568(char *URL)
   curl_easy_setopt(hnd, CURLOPT_HEADER, 1L);
   curl_easy_setopt(hnd, CURLOPT_USERPWD, "testuser:testpass");
   curl_easy_setopt(hnd, CURLOPT_USERAGENT, "lib1568");
-  curl_easy_setopt(hnd, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST);
+  curl_easy_setopt(hnd, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
   curl_easy_setopt(hnd, CURLOPT_MAXREDIRS, 50L);
   curl_easy_setopt(hnd, CURLOPT_PORT, strtol(libtest_arg2, NULL, 10));
 
diff --git a/tests/libtest/lib510.c b/tests/libtest/lib510.c
index bef9260c4e..c5d4a5582e 100644
--- a/tests/libtest/lib510.c
+++ b/tests/libtest/lib510.c
@@ -110,7 +110,7 @@ static CURLcode test_lib510(char *URL)
   test_setopt(curl, CURLOPT_HTTPHEADER, slist);
 
   if(testnum == 565) {
-    test_setopt(curl, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST);
+    test_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
     test_setopt(curl, CURLOPT_USERPWD, "foo:bar");
   }
 
diff --git a/tests/libtest/lib579.c b/tests/libtest/lib579.c
index fd47d55be9..8ec94c3f66 100644
--- a/tests/libtest/lib579.c
+++ b/tests/libtest/lib579.c
@@ -149,7 +149,7 @@ static CURLcode test_lib579(char *URL)
   /* enforce chunked transfer by setting the header */
   test_setopt(curl, CURLOPT_HTTPHEADER, slist);
 
-  test_setopt(curl, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST);
+  test_setopt(curl, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);
   test_setopt(curl, CURLOPT_USERPWD, "foo:bar");
 
   /* we want to use our own progress function */