diff --git a/aiogram/utils/text_decorations.py b/aiogram/utils/text_decorations.py
index 5b2cf51c..ad52c9d7 100644
--- a/aiogram/utils/text_decorations.py
+++ b/aiogram/utils/text_decorations.py
@@ -114,7 +114,7 @@ html_decoration = TextDecoration(
     quote=html.escape,
 )
 
-MARKDOWN_QUOTE_PATTERN = re.compile(r"([_*\[\]()~`>#+\-|{}.!])")
+MARKDOWN_QUOTE_PATTERN = re.compile(r"([_*\[\]()~`>#+\-=|{}.!])")
 
 markdown_decoration = TextDecoration(
     link="[{value}]({link})",