diff --git a/dexlib2/src/main/java/org/jf/dexlib2/writer/io/MemoryDataStore.java b/dexlib2/src/main/java/org/jf/dexlib2/writer/io/MemoryDataStore.java
index d3c68636..b60f7854 100644
--- a/dexlib2/src/main/java/org/jf/dexlib2/writer/io/MemoryDataStore.java
+++ b/dexlib2/src/main/java/org/jf/dexlib2/writer/io/MemoryDataStore.java
@@ -65,7 +65,7 @@ public class MemoryDataStore implements DexDataStore {
     }
 
     protected int getNewBufferSize(int currentSize, int newMinSize) {
-        return (int)(newMinSize * 1.2);
+        return newMinSize + (newMinSize >> 2);
     }
 
     @Nonnull @Override public InputStream readAt(final int offset) {