diff --git a/phonegap/phonegap.d.ts b/phonegap/phonegap.d.ts
index 37585887b3..7d744346a0 100644
--- a/phonegap/phonegap.d.ts
+++ b/phonegap/phonegap.d.ts
@@ -367,7 +367,7 @@ interface FileUploadResult {
 
 interface Flags {
     create: boolean;
-    exclusive: boolean;
+    exclusive?: boolean;
 }
 
 /*