diff --git a/src/proto/ops.pro b/src/proto/ops.pro
index ef044e7..0740dda 100644
--- a/src/proto/ops.pro
+++ b/src/proto/ops.pro
@@ -38,6 +38,7 @@
 int preprocs_left(void);
 int get_register_name(int num);
 void ex_display(exarg_T *eap);
+char_u *skip_comment(char_u *line, int process, int include_space, int *is_comment);
 int do_join(long count, int insert_space, int save_undo, int use_formatoptions, int setmark);
 void op_format(oparg_T *oap, int keep_cursor);
 void op_formatexpr(oparg_T *oap);