diff --git a/apps/macos/VODManager/Sources/VODManager/Services/VODSignature.swift b/apps/macos/VODManager/Sources/VODManager/Services/VODSignature.swift
index 56df256..5692538 100644
--- a/apps/macos/VODManager/Sources/VODManager/Services/VODSignature.swift
+++ b/apps/macos/VODManager/Sources/VODManager/Services/VODSignature.swift
@@ -40,8 +40,7 @@ struct VODSignature {
     }
 
     private static func percentEncode(_ value: String) -> String {
-        var allowed = CharacterSet.alphanumerics
-        allowed.insert(charactersIn: "-_.~")
+        let allowed = CharacterSet(charactersIn: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.~")
         return value.addingPercentEncoding(withAllowedCharacters: allowed) ?? value
     }
 }