diff --git a/plugins/dark-switcher.php b/plugins/dark-switcher.php
index df3ef2ac..10ea97f5 100644
--- a/plugins/dark-switcher.php
+++ b/plugins/dark-switcher.php
@@ -28,6 +28,8 @@ const saved = document.cookie.match(/adminer_dark=(\d)/);
 if (saved) {
 	adminerDark = +saved[1];
 	adminerDarkSet();
+} else {
+	adminerDark = +matchMedia('(prefers-color-scheme: dark)').matches;
 }
 </script>
 <?php
@@ -35,7 +37,7 @@ if (saved) {
 
 	function navigation($missing) {
 		echo "<big style='position: fixed; bottom: .5em; right: .5em; cursor: pointer;'>☀</big>"
-			. Adminer\script("if (adminerDark != null) adminerDarkSet(); qsl('big').onclick = adminerDarkSwitch;") . "\n"
+			. Adminer\script("adminerDarkSet(); qsl('big').onclick = adminerDarkSwitch;") . "\n"
 		;
 	}