1 files changed, 1 insertions, 1 deletions

diff --git a/tmux.h b/tmux.h
index 5fd57ee4..a91ed2e1 100644
--- a/tmux.h
+++ b/tmux.h
@@ -1621,7 +1621,7 @@ void	environ_put(struct environ *, const char *);
 void	environ_unset(struct environ *, const char *);
 void	environ_update(struct options *, struct environ *, struct environ *);
 void	environ_push(struct environ *);
-void	environ_log(struct environ *, const char *);
+void printflike(2, 3) environ_log(struct environ *, const char *, ...);
 struct environ *environ_for_session(struct session *, int);
 
 /* tty.c */