diff --git a/src/main/java/org/elasticsearch/index/get/ShardGetService.java b/src/main/java/org/elasticsearch/index/get/ShardGetService.java
index 43dfc6a2c57..ecc58f52ad7 100644
--- a/src/main/java/org/elasticsearch/index/get/ShardGetService.java
+++ b/src/main/java/org/elasticsearch/index/get/ShardGetService.java
@@ -266,6 +266,8 @@ public class ShardGetService extends AbstractIndexShardComponent {
                             if (source.ttl > 0) {
                                 value = docMapper.TTLFieldMapper().valueForSearch(source.timestamp + source.ttl);
                             }
+                        } else if (field.equals(SizeFieldMapper.NAME) && docMapper.rootMapper(SizeFieldMapper.class).stored()) {
+                            value = source.source.length();
                         } else {
                             if (field.contains("_source.")) {
                                 if (searchLookup == null) {