diff --git a/lib/getinfo.c b/lib/getinfo.c
index 5cf3bcacdd..56b5d6f9fd 100644
--- a/lib/getinfo.c
+++ b/lib/getinfo.c
@@ -75,7 +75,9 @@ CURLcode Curl_getinfo(struct SessionHandle *data, CURLINFO info, ...)
   double *param_doublep=NULL;
   char **param_charp=NULL;
   struct curl_slist **param_slistp=NULL;
+#ifdef MSG_PEEK
   char buf;
+#endif
 
   if(!data)
     return CURLE_BAD_FUNCTION_ARGUMENT;