diff --git a/src/proto/textprop.pro b/src/proto/textprop.pro
index 4d37174..0114b4f 100644
--- a/src/proto/textprop.pro
+++ b/src/proto/textprop.pro
@@ -13,7 +13,7 @@
 void f_prop_type_list(typval_T *argvars, typval_T *rettv);
 void clear_global_prop_types(void);
 void clear_buf_prop_types(buf_T *buf);
-void adjust_prop_columns(linenr_T lnum, colnr_T col, int bytes_added);
+int adjust_prop_columns(linenr_T lnum, colnr_T col, int bytes_added, int save_for_undo);
 void adjust_props_for_split(linenr_T lnum_props, linenr_T lnum_top, int kept, int deleted);
 void adjust_props_for_join(linenr_T lnum, textprop_T **prop_line, int *prop_length, long col, int removed);
 void join_prop_lines(linenr_T lnum, char_u *newp, textprop_T **prop_lines, int *prop_lengths, int count);