diff --git a/.travis.yml b/.travis.yml
index 23ee855..7610892 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,7 +6,7 @@ osx_image: xcode9.3
 
 before_install:
   # Uninstall existing brew installation.
-  - 'ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"'
+  - yes '' | 'ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/uninstall)"'
   - rm -rf /usr/local/Homebrew
   - rm -rf /usr/local/Caskroom
   - rm -rf /usr/local/bin/brew