diff --git a/cmd.c b/cmd.c
index 726799a8..5660dc72 100644
--- a/cmd.c
+++ b/cmd.c
@@ -180,7 +180,7 @@ cmd_unpack_argv(char *buf, size_t len, int argc, char ***argv)
 }
 
 char **
-cmd_copy_argv(int argc, char *const *argv)
+cmd_copy_argv(int argc, char **argv)
 {
 	char	**new_argv;
 	int	  i;
diff --git a/tmux.h b/tmux.h
index 04bbd935..a866d5b7 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1738,7 +1738,7 @@ long long	 args_strtonum(
 /* cmd.c */
 int		 cmd_pack_argv(int, char **, char *, size_t);
 int		 cmd_unpack_argv(char *, size_t, int, char ***);
-char	       **cmd_copy_argv(int, char *const *);
+char	       **cmd_copy_argv(int, char **);
 void		 cmd_free_argv(int, char **);
 struct cmd	*cmd_parse(int, char **, const char *, u_int, char **);
 size_t		 cmd_print(struct cmd *, char *, size_t);