diff --git a/src/cljx/org/nfrac/comportex/topology.cljx b/src/cljx/org/nfrac/comportex/topology.cljx
index a7262fb..3ec12ce 100644
--- a/src/cljx/org/nfrac/comportex/topology.cljx
+++ b/src/cljx/org/nfrac/comportex/topology.cljx
@@ -106,7 +106,7 @@
 
 (defn three-d-topology
   [w h d]
-  (three-d-topology w h d))
+  (->ThreeDTopology w h d))
 
 (defn make-topology
   [dims]