diff --git a/include/x11drv.h b/include/x11drv.h
index 66ad91d..432fb99 100644
--- a/include/x11drv.h
+++ b/include/x11drv.h
@@ -244,6 +244,7 @@
 extern INT X11DRV_CoerceDIBSection(struct tagDC *dc,INT,BOOL);
 extern INT X11DRV_LockDIBSection(struct tagDC *dc,INT,BOOL);
 extern void X11DRV_UnlockDIBSection(struct tagDC *dc,BOOL);
+extern INT X11DRV_CoerceDIBSection2(HBITMAP bmp,INT,BOOL);
 extern INT X11DRV_LockDIBSection2(HBITMAP bmp,INT,BOOL);
 extern void X11DRV_UnlockDIBSection2(HBITMAP bmp,BOOL);