diff --git a/utils/tmux/Makefile b/utils/tmux/Makefile
index 4855d6d31..1a7e6d147 100644
--- a/utils/tmux/Makefile
+++ b/utils/tmux/Makefile
@@ -16,6 +16,7 @@ PKG_SOURCE_URL:=@SF/tmux
 PKG_MD5SUM:=b07601711f96f1d260b390513b509a2d
 PKG_MAINTAINER:=Maxim Storchak <m.storchak@gmail.com>
 PKG_LICENSE:=ISC
+PKG_LICENSE_FILES:=COPYING
 
 PKG_INSTALL:=1