diff --git a/processing/src/main/java/io/druid/segment/incremental/SpatialDimensionRowFormatter.java b/processing/src/main/java/io/druid/segment/incremental/SpatialDimensionRowFormatter.java
index 1d624dfb75d..b9b4ce9cc74 100644
--- a/processing/src/main/java/io/druid/segment/incremental/SpatialDimensionRowFormatter.java
+++ b/processing/src/main/java/io/druid/segment/incremental/SpatialDimensionRowFormatter.java
@@ -56,7 +56,9 @@ public class SpatialDimensionRowFormatter
   {
     this.spatialDimensionMap = Maps.newHashMap();
     for (SpatialDimensionSchema spatialDimension : spatialDimensions) {
-      this.spatialDimensionMap.put(spatialDimension.getDimName(), spatialDimension);
+      if (this.spatialDimensionMap.put(spatialDimension.getDimName(), spatialDimension) != null) {
+        throw new ISE("Duplicate spatial dimension names found! Check your schema yo!");
+      }
     }
     this.spatialPartialDimNames = Sets.newHashSet(
         Iterables.concat(