diff --git a/src/lime/utils/AssetLibrary.hx b/src/lime/utils/AssetLibrary.hx
index a010d55d3..ea3770bdf 100644
--- a/src/lime/utils/AssetLibrary.hx
+++ b/src/lime/utils/AssetLibrary.hx
@@ -768,8 +768,7 @@ class AssetLibrary {
 
 		for (asset in manifest.assets) {
 
-			size = hasSize ? asset.size : 100;
-			if (size == null) size = 100;
+			size = hasSize && Reflect.hasField (asset, "size") ? asset.size : 100;
 			id = asset.id;
 
 			if (Reflect.hasField (asset, "path")) {