diff --git a/processing/src/main/java/io/druid/query/RetryQueryRunner.java b/processing/src/main/java/io/druid/query/RetryQueryRunner.java
index 37637a0862c..4d602a8d1ad 100644
--- a/processing/src/main/java/io/druid/query/RetryQueryRunner.java
+++ b/processing/src/main/java/io/druid/query/RetryQueryRunner.java
@@ -19,6 +19,7 @@ package io.druid.query;
 
 import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.metamx.common.guava.Sequence;
 import com.metamx.common.guava.Sequences;
@@ -90,9 +91,11 @@ public class RetryQueryRunner<T> implements QueryRunner<T>
           if (!config.isReturnPartialResults() && !finalMissingSegs.isEmpty()) {
             throw new SegmentMissingException("No results found for segments[%s]", finalMissingSegs);
           }
+          return toolChest.mergeSequencesUnordered(Sequences.simple(listOfSequences)).toYielder(initValue, accumulator);
+        }
+        else {
+          return Iterables.getOnlyElement(listOfSequences).toYielder(initValue, accumulator);
         }
-
-        return toolChest.mergeSequencesUnordered(Sequences.simple(listOfSequences)).toYielder(initValue, accumulator);
       }
     };
   }