diff --git a/src/main/java/org/elasticsearch/index/fielddata/plain/IntArrayAtomicFieldData.java b/src/main/java/org/elasticsearch/index/fielddata/plain/IntArrayAtomicFieldData.java
index d9ff0570f48..9a3337154f8 100644
--- a/src/main/java/org/elasticsearch/index/fielddata/plain/IntArrayAtomicFieldData.java
+++ b/src/main/java/org/elasticsearch/index/fielddata/plain/IntArrayAtomicFieldData.java
@@ -188,7 +188,7 @@ public abstract class IntArrayAtomicFieldData extends AtomicNumericFieldData {
         @Override
         public long getMemorySizeInBytes() {
             if (size == -1) {
-                size = RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_DOUBLE) + (set.getBits().length * RamUsage.NUM_BYTES_LONG);
+                size = RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_INT) + (set.getBits().length * RamUsage.NUM_BYTES_LONG);
             }
             return size;
         }
@@ -275,7 +275,7 @@ public abstract class IntArrayAtomicFieldData extends AtomicNumericFieldData {
         @Override
         public long getMemorySizeInBytes() {
             if (size == -1) {
-                size = RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_DOUBLE);
+                size = RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_INT);
             }
             return size;
         }
diff --git a/src/main/java/org/elasticsearch/index/fielddata/plain/LongArrayAtomicFieldData.java b/src/main/java/org/elasticsearch/index/fielddata/plain/LongArrayAtomicFieldData.java
index 869914f6c19..950c5ed5426 100644
--- a/src/main/java/org/elasticsearch/index/fielddata/plain/LongArrayAtomicFieldData.java
+++ b/src/main/java/org/elasticsearch/index/fielddata/plain/LongArrayAtomicFieldData.java
@@ -114,7 +114,7 @@ public abstract class LongArrayAtomicFieldData extends AtomicNumericFieldData {
         @Override
         public long getMemorySizeInBytes() {
             if (size == -1) {
-                size = RamUsage.NUM_BYTES_INT/*size*/ + RamUsage.NUM_BYTES_INT/*numDocs*/ + +RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_DOUBLE) + ordinals.getMemorySizeInBytes();
+                size = RamUsage.NUM_BYTES_INT/*size*/ + RamUsage.NUM_BYTES_INT/*numDocs*/ + +RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_LONG) + ordinals.getMemorySizeInBytes();
             }
             return size;
         }
@@ -275,7 +275,7 @@ public abstract class LongArrayAtomicFieldData extends AtomicNumericFieldData {
         @Override
         public long getMemorySizeInBytes() {
             if (size == -1) {
-                size = RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_DOUBLE);
+                size = RamUsage.NUM_BYTES_ARRAY_HEADER + (values.length * RamUsage.NUM_BYTES_LONG);
             }
             return size;
         }