diff --git a/docs/examples/httpput.c b/docs/examples/httpput.c
index ec80d3c9a3..48c9f70ec5 100644
--- a/docs/examples/httpput.c
+++ b/docs/examples/httpput.c
@@ -85,8 +85,9 @@ int main(int argc, char **argv)
     /* now specify which file to upload */
     curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);
 
-    /* and give the size of the upload (optional) */
-    curl_easy_setopt(curl, CURLOPT_INFILESIZE, file_info.st_size);
+    /* and give the size of the upload, make sure that we don't accidentally
+       pass a larger variable type than "long". */
+    curl_easy_setopt(curl, CURLOPT_INFILESIZE, (long) file_info.st_size);
 
     /* Now run off and do what you've been told! */
     res = curl_easy_perform(curl);