diff --git a/src/3rdparty/xcb/libxcb/xinput.c b/src/3rdparty/xcb/libxcb/xinput.c
index d4e3c250bc..5113213a61 100644
--- a/src/3rdparty/xcb/libxcb/xinput.c
+++ b/src/3rdparty/xcb/libxcb/xinput.c
@@ -10535,32 +10535,8 @@ xcb_input_device_class_data_sizeof (const void  *_buffer,
 int
 xcb_input_device_class_sizeof (const void  *_buffer)
 {
-    char *xcb_tmp = (char *)_buffer;
     const xcb_input_device_class_t *_aux = (xcb_input_device_class_t *)_buffer;
-    unsigned int xcb_buffer_len = 0;
-    unsigned int xcb_block_len = 0;
-    unsigned int xcb_pad = 0;
-    unsigned int xcb_align_to = 0;
-
-
-    xcb_block_len += sizeof(xcb_input_device_class_t);
-    xcb_tmp += xcb_block_len;
-    xcb_buffer_len += xcb_block_len;
-    xcb_block_len = 0;
-    /* data */
-    xcb_block_len += xcb_input_device_class_data_sizeof(xcb_tmp, _aux->type);
-    xcb_tmp += xcb_block_len;
-    xcb_align_to = ALIGNOF(char);
-    /* insert padding */
-    xcb_pad = -xcb_block_len & (xcb_align_to - 1);
-    xcb_buffer_len += xcb_block_len + xcb_pad;
-    if (0 != xcb_pad) {
-        xcb_tmp += xcb_pad;
-        xcb_pad = 0;
-    }
-    xcb_block_len = 0;
-
-    return xcb_buffer_len;
+    return (_aux->len * 4);
 }
 
 void *