diff --git a/tmux.h b/tmux.h
index 2e2d982f..4a5326cf 100644
--- a/tmux.h
+++ b/tmux.h
@@ -100,7 +100,8 @@ extern char   **environ;
 #define CHOOSE_CLIENT_TEMPLATE					\
 	"#{client_tty}: #{session_name} "			\
 	"[#{client_width}x#{client_height} #{client_termname}]"	\
-	"#{?client_utf8, (utf8),} #{?client_readonly, (ro),}"
+	"#{?client_utf8, (utf8),}#{?client_readonly, (ro),} "	\
+	"(last used #{client_activity_string})"
 
 /* Default templates for choose-tree. */
 #define CHOOSE_TREE_SESSION_TEMPLATE				\