diff --git a/DroidFish/assets/stockfish15.mygz b/DroidFish/assets/stockfish15.mygz
new file mode 100755
index 0000000..f9e5d8e
Binary files /dev/null and b/DroidFish/assets/stockfish15.mygz differ
diff --git a/DroidFish/src/org/petero/droidfish/engine/EngineUtil.java b/DroidFish/src/org/petero/droidfish/engine/EngineUtil.java
index 338878a..0229d99 100644
--- a/DroidFish/src/org/petero/droidfish/engine/EngineUtil.java
+++ b/DroidFish/src/org/petero/droidfish/engine/EngineUtil.java
@@ -37,7 +37,7 @@ public class EngineUtil {
     public static String internalStockFishName() {
         final int sdkVersion = Integer.parseInt(Build.VERSION.SDK);
         if (sdkVersion < 4)
-            return null;
+            return "stockfish15.mygz";
         return "stockfish-" + CpuAbi.get();
     }
 }
diff --git a/DroidFish/src/org/petero/droidfish/engine/InternalStockFish.java b/DroidFish/src/org/petero/droidfish/engine/InternalStockFish.java
index 7144495..c3a381e 100644
--- a/DroidFish/src/org/petero/droidfish/engine/InternalStockFish.java
+++ b/DroidFish/src/org/petero/droidfish/engine/InternalStockFish.java
@@ -28,6 +28,7 @@ import java.io.InputStream;
 import java.io.OutputStream;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
+import java.util.zip.GZIPInputStream;
 
 import android.content.Context;
 
@@ -73,6 +74,8 @@ public class InternalStockFish extends ExternalEngine {
         InputStream is = null;
         try {
             is = context.getAssets().open(sfExe);
+            if (sfExe.endsWith(".mygz"))
+                is = new GZIPInputStream(is);
             MessageDigest md = MessageDigest.getInstance("SHA-1");
             byte[] buf = new byte[8192];
             while (true) {
@@ -112,6 +115,8 @@ public class InternalStockFish extends ExternalEngine {
         to.createNewFile();
 
         InputStream is = context.getAssets().open(sfExe);
+        if (sfExe.endsWith(".mygz"))
+            is = new GZIPInputStream(is);
         OutputStream os = new FileOutputStream(to);
 
         try {