diff --git a/app/switch/resources/scripts/resources/functions/mkdir.lua b/app/switch/resources/scripts/resources/functions/mkdir.lua
index a0a55f38b1..ee52bf8996 100644
--- a/app/switch/resources/scripts/resources/functions/mkdir.lua
+++ b/app/switch/resources/scripts/resources/functions/mkdir.lua
@@ -4,7 +4,7 @@
 		dir = dir:gsub([[\]], "/");
 
 		--retrieve allowed characters and then use it to sanitize the dir variable
-		local allowed_chars = os.getenv("ALLOWED_CHARS") or "^%a%d%-%._~"
+		local allowed_chars = os.getenv("ALLOWED_CHARS") or "^%a%d%-%._~/"
 		dir = dir:gsub("[^" .. allowed_chars .. "]", "")
 
 		if (package.config:sub(1,1) == "/") then