Index: uspace/lib/libc/include/ipc/fb.h
===================================================================
--- uspace/lib/libc/include/ipc/fb.h	(revision 7122bc7ffe00d5531336885cabe3467b25ade0d9)
+++ uspace/lib/libc/include/ipc/fb.h	(revision bda24ee7e6220d31f6570cc4ac7804163db9055d)
@@ -48,4 +48,5 @@
 	FB_VIEWPORT_CREATE,
 	FB_VIEWPORT_DELETE,
+	FB_VIEWPORT_INVALIDATE,
 	FB_SET_STYLE,
 	FB_SET_COLOR,