diff --git a/src/SplatAccumulator.ts b/src/SplatAccumulator.ts
index a751e51..1a0bd66 100644
--- a/src/SplatAccumulator.ts
+++ b/src/SplatAccumulator.ts
@@ -97,7 +97,7 @@ export class SplatAccumulator {
     }
 
     this.splats.numSplats = numSplats;
-    this.toWorld = originToWorld;
+    this.toWorld.copy(originToWorld);
     this.mapping = generators;
     return updated !== 0;
   }