1 files changed, 1 insertions, 1 deletions
diff --git a/src/tty.c b/src/tty.c
index e5cfcb4fd..fe19b0110 100644
--- a/src/tty.c
+++ b/src/tty.c
@@ -43,7 +43,7 @@ enum
 #define AUTHORS proper_name ("David MacKenzie")
 
 /* The name under which this program was run. */
-char *program_name;
+char const *program_name;
 
 /* If true, return an exit status but produce no output. */
 static bool silent;