1 files changed, 2 insertions, 2 deletions
diff --git a/sed/sed.h b/sed/sed.h
index 5f947e9..d190700 100644
--- a/sed/sed.h
+++ b/sed/sed.h
@@ -231,8 +231,8 @@ extern countT lcmd_out_line_len;
 extern char *in_place_extension;
 
 /* The mode to use to read and write files, either "rt"/"w" or "rb"/"wb".  */
-extern char *read_mode;
-extern char *write_mode;
+extern char const *read_mode;
+extern char const *write_mode;
 
 /* Should we use EREs? */
 extern bool use_extended_syntax_p;