diff --git a/src/vim.h b/src/vim.h
index 7ef9b00..85d92d5 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -627,6 +627,7 @@
 // flags for screen_line()
 #define SLF_RIGHTLEFT	1
 #define SLF_POPUP	2
+#define SLF_INC_VCOL	4
 
 #define MB_FILLER_CHAR '<'  // character used when a double-width character
 			    // doesn't fit.