diff --git a/src/pixi/loaders/SpriteSheetLoader.js b/src/pixi/loaders/SpriteSheetLoader.js
index 593ce41..f2c97f6 100644
--- a/src/pixi/loaders/SpriteSheetLoader.js
+++ b/src/pixi/loaders/SpriteSheetLoader.js
@@ -46,7 +46,7 @@
 	}
 		
 	this.ajaxRequest.open("GET", this.url, true)
-	this.ajaxRequest.overrideMimeType("application/json");
+	if (this.ajaxRequest.overrideMimeType) this.ajaxRequest.overrideMimeType("application/json");
 	this.ajaxRequest.send(null)
 }