diff --git a/client/src/util/stateManager/world.js b/client/src/util/stateManager/world.js
index 6da791ba..87230cc1 100644
--- a/client/src/util/stateManager/world.js
+++ b/client/src/util/stateManager/world.js
@@ -301,7 +301,7 @@ export function createVarDimension(
   const worldIndex = worldObsIndex ? idx => worldObsIndex[idx] : idx => idx;
 
   return crossfilter.dimension(r => {
-    return varData[worldIndex(r.__obsIndex__)];
+    return varData[worldIndex(r.__index__)];
   }, Float32Array);
 }