diff --git a/jme3-core/src/plugins/java/com/jme3/export/binary/BinaryExporter.java b/jme3-core/src/plugins/java/com/jme3/export/binary/BinaryExporter.java
index 7575180452..95cb55ab8d 100644
--- a/jme3-core/src/plugins/java/com/jme3/export/binary/BinaryExporter.java
+++ b/jme3-core/src/plugins/java/com/jme3/export/binary/BinaryExporter.java
@@ -320,8 +320,8 @@ private int findPrevMatch(BinaryIdContentPair oldPair,
     protected byte[] fixClassAlias(byte[] bytes, int width) {
         if (bytes.length != width) {
             byte[] newAlias = new byte[width];
-            if (width - (width - bytes.length) >= 0)
-                System.arraycopy(bytes, width - bytes.length - bytes.length, newAlias, width - bytes.length, width - (width - bytes.length));
+            if (bytes.length >= 0)
+                System.arraycopy(bytes, width - 2 * bytes.length, newAlias, width - bytes.length, bytes.length);
             return newAlias;
         }
         return bytes;