diff --git a/tests/libtest/lib582.c b/tests/libtest/lib582.c
index b367550cc9..3797e87bb6 100644
--- a/tests/libtest/lib582.c
+++ b/tests/libtest/lib582.c
@@ -129,7 +129,7 @@ static int checkForCompletion(CURLM* curl, int* success)
   CURLMsg* message;
   int result = 0;
   *success = 0;
-  while ((message = curl_multi_info_read(curl, &numMessages)) != 0) {
+  while ((message = curl_multi_info_read(curl, &numMessages)) != NULL) {
     if (message->msg == CURLMSG_DONE) {
       result = 1;
       if (message->data.result == CURLE_OK)
@@ -139,7 +139,7 @@ static int checkForCompletion(CURLM* curl, int* success)
     }
     else {
       fprintf(stderr, "Got an unexpected message from curl: %i\n",
-              message->msg);
+              (int)message->msg);
       result = 1;
       *success = 0;
     }