diff --git a/gm/gm.d.ts b/gm/gm.d.ts
index 2373300fee..f1fb40661b 100644
--- a/gm/gm.d.ts
+++ b/gm/gm.d.ts
@@ -13,6 +13,7 @@ declare module "gm" {
 	module m {
 		export interface ClassOptions {
 			imageMagick?: boolean;
+			nativeAutoOrient?: boolean;
 		}
 
 		export interface CompareCallback {