diff --git a/cache/src/main/java/net/runelite/cache/definitions/loaders/TrackLoader.java b/cache/src/main/java/net/runelite/cache/definitions/loaders/TrackLoader.java
index 2496ccff05..7de437baf5 100644
--- a/cache/src/main/java/net/runelite/cache/definitions/loaders/TrackLoader.java
+++ b/cache/src/main/java/net/runelite/cache/definitions/loaders/TrackLoader.java
@@ -246,8 +246,7 @@ public class TrackLoader
 		var1.skip(var25);
 		int var50 = var1.getOffset();
 		var1.skip(tempoOpcodes * 3);
-		def.midi = new byte[offset];
-		OutputStream var51 = new OutputStream(def.midi);
+		OutputStream var51 = new OutputStream(offset);
 		var51.writeInt(1297377380); // MThd header
 		var51.writeInt(6); // length of header
 		var51.writeShort(tracks > 1 ? 1 : 0); // format
@@ -457,5 +456,6 @@ public class TrackLoader
 			}
 		}
 
+		def.midi = var51.flip();
 	}
 }
diff --git a/cache/src/main/java/net/runelite/cache/io/OutputStream.java b/cache/src/main/java/net/runelite/cache/io/OutputStream.java
index 4460be7925..fe136c4d30 100644
--- a/cache/src/main/java/net/runelite/cache/io/OutputStream.java
+++ b/cache/src/main/java/net/runelite/cache/io/OutputStream.java
@@ -41,11 +41,6 @@ public final class OutputStream extends java.io.OutputStream
 		this(16);
 	}
 
-	public OutputStream(byte[] b)
-	{
-		buffer = ByteBuffer.wrap(b);
-	}
-
 	public byte[] getArray()
 	{
 		assert buffer.hasArray();