diff --git a/src/main/java/org/elasticsearch/index/mapper/core/IntegerFieldMapper.java b/src/main/java/org/elasticsearch/index/mapper/core/IntegerFieldMapper.java
index 39bf7acd986..9bbe52b1ee0 100644
--- a/src/main/java/org/elasticsearch/index/mapper/core/IntegerFieldMapper.java
+++ b/src/main/java/org/elasticsearch/index/mapper/core/IntegerFieldMapper.java
@@ -133,7 +133,7 @@ public class IntegerFieldMapper extends NumberFieldMapper<Integer> {
 
     @Override
     public org.elasticsearch.index.fielddata.FieldDataType fieldDataType2() {
-        throw new ElasticSearchIllegalArgumentException("not implemented");
+        return new org.elasticsearch.index.fielddata.FieldDataType("int");
     }
 
     @Override