diff --git a/scripts/uosc/lib/utils.lua b/scripts/uosc/lib/utils.lua
index f25c52e..97f8bbd 100644
--- a/scripts/uosc/lib/utils.lua
+++ b/scripts/uosc/lib/utils.lua
@@ -319,7 +319,7 @@ end
 -- Check if path is a protocol, such as `http://...`.
 ---@param path string
 function is_protocol(path)
-	return type(path) == 'string' and (path:find('^%a[%a%d-_]+://') ~= nil or path:find('^%a[%a%d-_]+:\\?') ~= nil)
+	return type(path) == 'string' and (path:find('^%a[%a%d-_]+://') ~= nil or path:find('^%a[%a%d-_]+:%?') ~= nil)
 end
 
 ---@param path string