diff --git a/frontend/src/ts/settings/theme-picker.ts b/frontend/src/ts/settings/theme-picker.ts
index 6a83ae575..fe62e0973 100644
--- a/frontend/src/ts/settings/theme-picker.ts
+++ b/frontend/src/ts/settings/theme-picker.ts
@@ -25,7 +25,7 @@ export function updateActiveButton(): void {
     ?.classList.remove("active");
   document
     .querySelector(
-      `.pageSettings .section.themes .theme[theme=${activeThemeName}]`
+      `.pageSettings .section.themes .theme[theme='${activeThemeName}']`
     )
     ?.classList.add("active");
 }