diff --git a/tests/fixtures/system-defaults-write/user.txt b/tests/fixtures/system-defaults-write/user.txt
index ca7334f..9041542 100644
--- a/tests/fixtures/system-defaults-write/user.txt
+++ b/tests/fixtures/system-defaults-write/user.txt
@@ -18,6 +18,11 @@ launchctl asuser "$(id -u -- test-defaults-user)" sudo --user=test-defaults-user
 <plist version="1.0">
 <true/>
 </plist>'
+launchctl asuser "$(id -u -- test-defaults-user)" sudo --user=test-defaults-user -- defaults write -g AppleIconAppearanceTheme '<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<string>DarkRegular</string>
+</plist>'
 launchctl asuser "$(id -u -- test-defaults-user)" sudo --user=test-defaults-user -- defaults write -g AppleKeyboardUIMode '<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
diff --git a/tests/system-defaults-write.nix b/tests/system-defaults-write.nix
index 6f67338..4af5512 100644
--- a/tests/system-defaults-write.nix
+++ b/tests/system-defaults-write.nix
@@ -26,6 +26,7 @@
   system.defaults.NSGlobalDomain.AppleEnableMouseSwipeNavigateWithScrolls = false;
   system.defaults.NSGlobalDomain.AppleEnableSwipeNavigateWithScrolls = false;
   system.defaults.NSGlobalDomain.AppleFontSmoothing = 1;
+  system.defaults.NSGlobalDomain.AppleIconAppearanceTheme = "DarkRegular";
   system.defaults.NSGlobalDomain.AppleICUForce24HourTime = true;
   system.defaults.NSGlobalDomain.AppleKeyboardUIMode = 3;
   system.defaults.NSGlobalDomain.ApplePressAndHoldEnabled = true;