diff --git a/src/engine/InterestManagement/Terrain.java b/src/engine/InterestManagement/Terrain.java
index 6a26faba..b484134a 100644
--- a/src/engine/InterestManagement/Terrain.java
+++ b/src/engine/InterestManagement/Terrain.java
@@ -120,7 +120,7 @@ public class Terrain {
 
         // Blend between terrains
 
-        return interpolatedChildHeight + parentZone.global_height * (1 - terrainZone.terrain.terrainBlend(terrainOffset));
+        return interpolatedChildHeight + interpolatedParentTerrainHeight * (1 - terrainZone.terrain.terrainBlend(terrainOffset));
 
     }