diff --git a/ReactAndroid/src/main/java/com/facebook/react/devsupport/BundleDownloader.java b/ReactAndroid/src/main/java/com/facebook/react/devsupport/BundleDownloader.java
index a6aeb18f1a0..ad127b7462e 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/devsupport/BundleDownloader.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/devsupport/BundleDownloader.java
@@ -286,7 +286,7 @@ public class BundleDownloader {
     return true;
   }
 
-  private boolean storeDeltaInFile(BufferedSource body, File outputFile) throws IOException {
+  private synchronized boolean storeDeltaInFile(BufferedSource body, File outputFile) throws IOException {
 
     JsonReader jsonReader = new JsonReader(new InputStreamReader(body.inputStream()));