diff --git a/libavdevice/xcbgrab.c b/libavdevice/xcbgrab.c
index f169f93665..2da7ec7d4f 100644
--- a/libavdevice/xcbgrab.c
+++ b/libavdevice/xcbgrab.c
@@ -591,7 +591,7 @@ static void setup_window(AVFormatContext *s)
     uint32_t values[] = { 1,
                           XCB_EVENT_MASK_EXPOSURE |
                           XCB_EVENT_MASK_STRUCTURE_NOTIFY };
-    xcb_rectangle_t rect = { 0, 0, c->width, c->height };
+    av_unused xcb_rectangle_t rect = { 0, 0, c->width, c->height };
 
     c->window = xcb_generate_id(c->conn);