diff --git a/libavformat/http.c b/libavformat/http.c
index 376ff9efd9..85ed7a5c81 100644
--- a/libavformat/http.c
+++ b/libavformat/http.c
@@ -33,7 +33,7 @@
    only a subset of it. */
 
 /* used for protocol handling */
-#define BUFFER_SIZE 1024
+#define BUFFER_SIZE 4096
 #define MAX_REDIRECTS 8
 
 typedef struct {
@@ -380,7 +380,7 @@ static int http_connect(URLContext *h, const char *path, const char *local_path,
 {
     HTTPContext *s = h->priv_data;
     int post, err;
-    char headers[1024] = "";
+    char headers[4096] = "";
     char *authstr = NULL, *proxyauthstr = NULL;
     int64_t off = s->off;
     int len = 0;