diff --git a/Casks/libreoffice-still.rb b/Casks/libreoffice-still.rb
index 195a814b5..1488564fe 100644
--- a/Casks/libreoffice-still.rb
+++ b/Casks/libreoffice-still.rb
@@ -8,6 +8,10 @@ cask 'libreoffice-still' do
   homepage 'https://www.libreoffice.org/download/libreoffice-still/'
   gpg "#{url}.asc", key_id: 'c2839ecad9408fbe9531c3e9f434a1efafeeaea3'
 
+  conflicts_with cask: [
+                         'libreoffice',
+                         'libreoffice-dev',
+                       ]
   depends_on macos: '>= :mountain_lion'
 
   app 'LibreOffice.app'