diff --git a/src/vim.h b/src/vim.h
index 6db4818..9445fa2 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -2778,6 +2778,7 @@
 // Flags for adjust_prop_columns()
 #define APC_SAVE_FOR_UNDO	1   // call u_savesub() before making changes
 #define APC_SUBSTITUTE		2   // text is replaced, not inserted
+#define APC_INDENT		4   // changing indent
 
 #define CLIP_ZINDEX 32000