diff --git a/docs/examples/anyauthput.c b/docs/examples/anyauthput.c
index eb91d991b..14da10c3b 100644
--- a/docs/examples/anyauthput.c
+++ b/docs/examples/anyauthput.c
@@ -26,16 +26,19 @@
  */
 #include <stdio.h>
 #include <fcntl.h>
-#ifdef WIN32
-#  include <io.h>
-#else
-#  include <unistd.h>
-#endif
 #include <sys/types.h>
 #include <sys/stat.h>
 
 #include <curl/curl.h>
 
+#ifdef WIN32
+#  include <io.h>
+#  define READ_3RD_ARG unsigned int
+#else
+#  include <unistd.h>
+#  define READ_3RD_ARG size_t
+#endif
+
 #if LIBCURL_VERSION_NUM < 0x070c03
 #error "upgrade your libcurl to no less than 7.12.3"
 #endif
@@ -83,7 +86,7 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
   int *fdp = (int *)stream;
   int fd = *fdp;
 
-  retcode = read(fd, ptr, size * nmemb);
+  retcode = read(fd, ptr, (READ_3RD_ARG)(size * nmemb));
 
   nread = (curl_off_t)retcode;