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diff --git a/src/proguard/classfile/editor/InterfaceSorter.java b/src/proguard/classfile/editor/InterfaceSorter.java
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+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.classfile.editor;
+
+import proguard.classfile.*;
+import proguard.classfile.util.SimplifiedVisitor;
+import proguard.classfile.visitor.ClassVisitor;
+
+import java.util.Arrays;
+
+/**
+ * This ClassVisitor sorts the interfaces of the program classes that it visits.
+ *
+ * @author Eric Lafortune
+ */
+public class InterfaceSorter
+extends      SimplifiedVisitor
+implements   ClassVisitor
+{
+    // Implementations for ClassVisitor.
+
+    public void visitProgramClass(ProgramClass programClass)
+    {
+        int[] interfaces      = programClass.u2interfaces;
+        int   interfacesCount = programClass.u2interfacesCount;
+
+        // Sort the interfaces.
+        Arrays.sort(interfaces, 0, interfacesCount);
+
+        // Remove any duplicate entries.
+        int newInterfacesCount     = 0;
+        int previousInterfaceIndex = 0;
+        for (int index = 0; index < interfacesCount; index++)
+        {
+            int interfaceIndex = interfaces[index];
+
+            // Isn't this a duplicate of the previous interface?
+            if (interfaceIndex != previousInterfaceIndex)
+            {
+                interfaces[newInterfacesCount++] = interfaceIndex;
+
+                // Remember the interface.
+                previousInterfaceIndex = interfaceIndex;
+            }
+        }
+
+        programClass.u2interfacesCount = newInterfacesCount;
+    }
+}