Index: uspace/lib/libc/include/ipc/fb.h
===================================================================
--- uspace/lib/libc/include/ipc/fb.h	(revision 59b2adb4808ec5724445deaa809570893f7fa924)
+++ uspace/lib/libc/include/ipc/fb.h	(revision 42ec9198d3475719dcc6743cb7e015e9ecc84a50)
@@ -48,4 +48,5 @@
 	FB_VIEWPORT_CREATE,
 	FB_VIEWPORT_DELETE,
+	FB_VIEWPORT_INVALIDATE,
 	FB_SET_STYLE,
 	FB_SET_COLOR,