diff --git a/src/gallium/drivers/r300/r300_winsys.h b/src/gallium/drivers/r300/r300_winsys.h
index 187780750fa..4597332399a 100644
--- a/src/gallium/drivers/r300/r300_winsys.h
+++ b/src/gallium/drivers/r300/r300_winsys.h
@@ -33,6 +33,7 @@
 
 #include "r300_defines.h"
 
+struct winsys_handle;
 struct r300_winsys_screen;
 
 struct r300_winsys_buffer;