diff --git "a/dll/win32/winhttp/request.c" "b/dll/win32/winhttp/request.c"
index da28f7b1826..67ed1994d6a 100644
--- "a/dll/win32/winhttp/request.c"
+++ "b/dll/win32/winhttp/request.c"
@@ -2042,6 +2042,14 @@ static BOOL read_data( struct request *request, void *buffer, DWORD size, DWORD
 
 done:
     TRACE( "retrieved %u bytes (%u/%u)\n", bytes_read, request->content_read, request->content_length );
+
+    /* Check if we need time to let the receive buffer catch up */
+    if (request->content_read == request->content_length &&
+        (request->content_read > 50 * 1024))
+    {
+        Sleep(request->content_length / 20);
+    }
+
     if (async)
     {
         if (ret) send_callback( &request->hdr, WINHTTP_CALLBACK_STATUS_READ_COMPLETE, buffer, bytes_read );