diff --git a/tests/system-defaults-write.nix b/tests/system-defaults-write.nix
index dc4752eb..e3f69fec 100644
--- a/tests/system-defaults-write.nix
+++ b/tests/system-defaults-write.nix
@@ -51,6 +51,7 @@
   system.defaults.smb.NetBIOSName = "IMAC-000000";
   system.defaults.smb.ServerDescription = ''Darwin\\\\U2019s iMac'';
   system.defaults.universalaccess.mouseDriverCursorSize = 1.5;
+  system.defaults.universalaccess.reduceMotion = true;
   system.defaults.universalaccess.reduceTransparency = true;
   system.defaults.universalaccess.closeViewScrollWheelToggle = true;
   system.defaults.universalaccess.closeViewZoomFollowsFocus = true;
@@ -120,6 +121,7 @@
     grep "defaults write com.apple.screensaver 'askForPassword' -bool YES" ${config.out}/activate-user
     grep "defaults write com.apple.screensaver 'askForPasswordDelay' -int 5" ${config.out}/activate-user
     grep "defaults write com.apple.universalaccess 'mouseDriverCursorSize' -float 1.5" ${config.out}/activate-user
+    grep "defaults write com.apple.universalaccess 'reduceMotion' -bool YES" ${config.out}/activate-user
     grep "defaults write com.apple.universalaccess 'reduceTransparency' -bool YES" ${config.out}/activate-user
     grep "defaults write com.apple.universalaccess 'closeViewScrollWheelToggle' -bool YES" ${config.out}/activate-user
     grep "defaults write com.apple.universalaccess 'closeViewZoomFollowsFocus' -bool YES" ${config.out}/activate-user