diff --git a/forge/src/main/java/com/unlikepaladin/pfm/blocks/models/forge/PFMForgeBakedModel.java b/forge/src/main/java/com/unlikepaladin/pfm/blocks/models/forge/PFMForgeBakedModel.java
index 858942135..43cd1a489 100644
--- a/forge/src/main/java/com/unlikepaladin/pfm/blocks/models/forge/PFMForgeBakedModel.java
+++ b/forge/src/main/java/com/unlikepaladin/pfm/blocks/models/forge/PFMForgeBakedModel.java
@@ -60,8 +60,11 @@ public List<BakedQuad> getQuadsWithTexture(List<BakedQuad> quads, List<Sprite> t
         for (BakedQuad quad : quads) {
             Identifier sprite = quad.getSprite().getId();
             if (separatedQuads.containsKey(sprite)) {
-                if (!separatedQuads.get(sprite).contains(quad))
-                    separatedQuads.get(sprite).add(quad);
+                if (!separatedQuads.get(sprite).contains(quad)) {
+                    List<BakedQuad> newQuadList = new ArrayList<>(separatedQuads.get(sprite));
+                    newQuadList.add(quad);
+                    separatedQuads.put(sprite, newQuadList);
+                }
                 continue;
             }
             List<BakedQuad> list = new ArrayList<>();