1 files changed, 1 insertions, 1 deletions

diff --git a/hw/qxl.h b/hw/qxl.h
index 11a0db3..cbb1e2d 100644
--- a/hw/qxl.h
+++ b/hw/qxl.h
@@ -127,7 +127,7 @@ typedef struct PCIQXLDevice {
 
 /* qxl.c */
 void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL phys, int group_id);
-void qxl_guest_bug(PCIQXLDevice *qxl, const char *msg, ...);
+void qxl_guest_bug(PCIQXLDevice *qxl, const char *msg, ...) GCC_FMT_ATTR(2, 3);
 
 void qxl_spice_update_area(PCIQXLDevice *qxl, uint32_t surface_id,
                            struct QXLRect *area, struct QXLRect *dirty_rects,