diff --git a/src/lib/utils/marked/katex-extension.ts b/src/lib/utils/marked/katex-extension.ts
index 073ee581d5..81425e5fe2 100644
--- a/src/lib/utils/marked/katex-extension.ts
+++ b/src/lib/utils/marked/katex-extension.ts
@@ -10,7 +10,7 @@ const DELIMITER_LIST = [
 
 // Defines characters that are allowed to immediately precede or follow a math delimiter.
 const ALLOWED_SURROUNDING_CHARS =
-	'\\s。，、､;；„“‘’“”（）「」『』［］《》【】‹›«»…⋯:：？！～⇒?!-\\/:-@\\[-`{-~\\p{Script=Han}\\p{Script=Hiragana}\\p{Script=Katakana}\\p{Script=Hangul}';
+	'\\s。，、､;；„“‘’“”（）「」『』［］《》【】‹›«»…⋯–—:：？！～⇒?!-\\/:-@\\[-`{-~\\p{Script=Han}\\p{Script=Hiragana}\\p{Script=Katakana}\\p{Script=Hangul}';
 // Modified to fit more formats in different languages. Originally: '\\s?。，、；!-\\/:-@\\[-`{-~\\p{Script=Han}\\p{Script=Hiragana}\\p{Script=Katakana}\\p{Script=Hangul}';
 
 // Pre-compile the surrounding character regex once at module load time.