diff --git a/services/web/frontend/js/features/source-editor/extensions/math-preview.ts b/services/web/frontend/js/features/source-editor/extensions/math-preview.ts
index f3f262568b..d946769fb3 100644
--- a/services/web/frontend/js/features/source-editor/extensions/math-preview.ts
+++ b/services/web/frontend/js/features/source-editor/extensions/math-preview.ts
@@ -30,7 +30,7 @@ const HIDE_TOOLTIP_EVENT = 'editor:hideMathTooltip'
 
 export const mathPreview = (enabled: boolean): Extension => {
   return mathPreviewConf.of(
-    enabled ? [mathPreviewTheme, mathPreviewStateField] : []
+    enabled ? [mathPreviewTheme, mathPreviewStateField] : [mathPreviewTheme]
   )
 }