diff --git a/ansible/roles/osx/vars/defaults.yml b/ansible/roles/osx/vars/defaults.yml
index 8fb5032..21145e1 100644
--- a/ansible/roles/osx/vars/defaults.yml
+++ b/ansible/roles/osx/vars/defaults.yml
@@ -45,6 +45,10 @@ osx_defaults:
     key: com.apple.mouse.tapBehavior
     type: bool
     value: true
+  - # only show scrollbars when scrolling
+    key: AppleShowScrollBars
+    type: string
+    value: WhenScrolling
 
   - # enable Debug menu in Safari
     domain: com.apple.Safari