diff --git a/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java b/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java
index 401c7da134e..cefed40b20e 100644
--- a/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java
+++ b/extensions-core/datasketches/src/main/java/io/druid/query/aggregation/datasketches/theta/SketchMergeAggregatorFactory.java
@@ -150,17 +150,6 @@ public class SketchMergeAggregatorFactory extends SketchAggregatorFactory
     }
   }
 
-  @Override
-  public byte[] getCacheKey()
-  {
-    final byte[] superCacheKey = super.getCacheKey();
-
-    return ByteBuffer.allocate(superCacheKey.length + 1)
-                     .put(superCacheKey)
-                     .put(isInputThetaSketch ? (byte) 1 : (byte) 0)
-                     .array();
-  }
-
   @Override
   public boolean equals(Object o)
   {