diff --git a/.changeset/short-flies-itch.md b/.changeset/short-flies-itch.md
new file mode 100644
index 000000000000..929bdec522aa
--- /dev/null
+++ b/.changeset/short-flies-itch.md
@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Fixed errorOverlay theme toggle bug.
diff --git a/packages/astro/src/core/errors/overlay.ts b/packages/astro/src/core/errors/overlay.ts
index 282c79cd6a21..9bfc562ba46f 100644
--- a/packages/astro/src/core/errors/overlay.ts
+++ b/packages/astro/src/core/errors/overlay.ts
@@ -593,13 +593,14 @@ class ErrorOverlay extends HTMLElement {
 				window.matchMedia('(prefers-color-scheme: dark)').matches)
 		) {
 			this?.classList.add('astro-dark');
+			localStorage.astroErrorOverlayTheme = 'dark';
 			themeToggle!.checked = true;
 		} else {
 			this?.classList.remove('astro-dark');
 			themeToggle!.checked = false;
 		}
 		themeToggle?.addEventListener('click', () => {
-			const isDark = localStorage.astroErrorOverlayTheme === 'dark';
+			const isDark = localStorage.astroErrorOverlayTheme === 'dark' || this?.classList.contains('astro-dark');
 			this?.classList.toggle('astro-dark', !isDark);
 			localStorage.astroErrorOverlayTheme = isDark ? 'light' : 'dark';
 		});