diff --git a/docs/examples/chkspeed.c b/docs/examples/chkspeed.c
index c56fe3ccc..d802469b8 100644
--- a/docs/examples/chkspeed.c
+++ b/docs/examples/chkspeed.c
@@ -40,6 +40,8 @@ static size_t WriteCallback(void *ptr, size_t size, size_t nmemb, void *data)
 {
   /* we are not interested in the downloaded bytes itself,
      so we only return the size we would have saved ... */
+  (void)ptr;  /* unused */
+  (void)data; /* unused */
   return (size_t)(size * nmemb);
 }
 
@@ -48,7 +50,7 @@ int main(int argc, char *argv[])
   CURL *curl_handle;
   CURLcode res;
   int prtsep = 0, prttime = 0;
-  char *url = URL_1M;
+  const char *url = URL_1M;
   char *appname = argv[0];
 
   if (argc > 1) {
@@ -135,17 +137,17 @@ int main(int argc, char *argv[])
 
     /* check for bytes downloaded */
     res = curl_easy_getinfo(curl_handle, CURLINFO_SIZE_DOWNLOAD, &val);
-    if((CURLE_OK == res) && val)
+    if((CURLE_OK == res) && (val>0))
       printf("Data downloaded: %0.0f bytes.\n", val);
 
     /* check for total download time */
     res = curl_easy_getinfo(curl_handle, CURLINFO_TOTAL_TIME, &val);
-    if((CURLE_OK == res) && val)
+    if((CURLE_OK == res) && (val>0))
       printf("Total download time: %0.3f sec.\n", val);
 
     /* check for average download speed */
     res = curl_easy_getinfo(curl_handle, CURLINFO_SPEED_DOWNLOAD, &val);
-    if((CURLE_OK == res) && val)
+    if((CURLE_OK == res) && (val>0))
       printf("Average download speed: %0.3f kbyte/sec.\n", val / 1024);
 
   } else {