diff --git a/Foundation/UserDefaults.swift b/Foundation/UserDefaults.swift
index 42cbd0d29c..a1eba75d14 100644
--- a/Foundation/UserDefaults.swift
+++ b/Foundation/UserDefaults.swift
@@ -247,7 +247,7 @@ open class UserDefaults: NSObject {
         set(NSNumber(value: value), forKey: defaultName)
     }
     open func set(_ url: URL?, forKey defaultName: String) {
-		if let url = url {
+        if let url = url {
             //FIXME: CFURLIsFileReferenceURL is limited to OS X/iOS
             #if os(OSX) || os(iOS)
                 //FIXME: no SwiftFoundation version of CFURLIsFileReferenceURL at time of writing!