diff --git a/Tools/travis-osx-install.sh b/Tools/travis-osx-install.sh
index b717b44a4..71545ad5c 100755
--- a/Tools/travis-osx-install.sh
+++ b/Tools/travis-osx-install.sh
@@ -32,6 +32,9 @@ case "$SWIGLANG" in
 	"python")
 		WITHLANG=$SWIGLANG$PY3
 		;;
+	"tcl")
+		travis_retry Tools/brew-install --cask tcl
+		;;
 esac
 
 # Workaround for https://github.com/travis-ci/travis-ci/issues/6522