diff --git a/spine-tk2d/Code/tk2dSpineAttachmentLoader.cs b/spine-tk2d/Code/tk2dSpineAttachmentLoader.cs
index 14f1096bc..f5b6af31a 100644
--- a/spine-tk2d/Code/tk2dSpineAttachmentLoader.cs
+++ b/spine-tk2d/Code/tk2dSpineAttachmentLoader.cs
@@ -23,8 +23,8 @@ public class tk2dSpineAttachmentLoader : AttachmentLoader {
 		if(type != AttachmentType.region) throw new Exception("Unknown attachment type: " + type);
 		
 		tk2dSpriteDefinition attachmentParameters = null;
-		for(int i = 0; i < sprites.spriteDefinitions.Length; ++i) {
-			tk2dSpriteDefinition def = sprites.spriteDefinitions[i];
+		for(int i = 0; i < sprites.inst.spriteDefinitions.Length; ++i) {
+			tk2dSpriteDefinition def = sprites.inst.spriteDefinitions[i];
 			if(def.name == name) {
 				attachmentParameters = def;
 				break;
diff --git a/spine-tk2d/Code/tk2dSpineSkeleton.cs b/spine-tk2d/Code/tk2dSpineSkeleton.cs
index 33528e2e9..82983b5a9 100644
--- a/spine-tk2d/Code/tk2dSpineSkeleton.cs
+++ b/spine-tk2d/Code/tk2dSpineSkeleton.cs
@@ -10,7 +10,7 @@ using Spine;
 [ExecuteInEditMode]
 [RequireComponent(typeof(MeshFilter))]
 [RequireComponent(typeof(MeshRenderer))]
-public class tk2dSpineSkeleton : MonoBehaviour {
+public class tk2dSpineSkeleton : MonoBehaviour, tk2dRuntime.ISpriteCollectionForceBuild {
 	
 	/*
 	 */
@@ -137,7 +137,7 @@ public class tk2dSpineSkeleton : MonoBehaviour {
 		mesh.triangles = triangles;
 		mesh.RecalculateNormals();
 		
-		renderer.sharedMaterial = skeletonDataAsset.sprites.spriteCollection.materials[0];
+		renderer.sharedMaterial = skeletonDataAsset.sprites.spriteCollection.inst.materials[0];
 	}
 	
 	/*
@@ -188,4 +188,15 @@ public class tk2dSpineSkeleton : MonoBehaviour {
 		state.Update(Time.deltaTime * animationSpeed);
 		state.Apply(skeleton);
 	}
+
+	public bool UsesSpriteCollection(tk2dSpriteCollectionData spriteCollection) {
+		return skeletonDataAsset.sprites.spriteCollection == spriteCollection;
+	}
+
+	public void ForceBuild() {
+		skeletonDataAsset.ForceUpdate();
+		skeleton = new Skeleton(skeletonDataAsset.GetSkeletonData());
+		
+		UpdateMesh();
+	}
 }
diff --git a/spine-tk2d/Code/tk2dSpineSkeletonDataAsset.cs b/spine-tk2d/Code/tk2dSpineSkeletonDataAsset.cs
index a47e40da1..ddba8b969 100644
--- a/spine-tk2d/Code/tk2dSpineSkeletonDataAsset.cs
+++ b/spine-tk2d/Code/tk2dSpineSkeletonDataAsset.cs
@@ -68,4 +68,8 @@ public class tk2dSpineSkeletonDataAsset : ScriptableObject {
 			stateData.SetMix(fromAnimation[i],toAnimation[i],duration[i]);
 		}
 	}
+
+	public void ForceUpdate() {
+		MakeSkeletonAndAnimationData();
+	}
 }