diff --git a/src/org/jetbrains/java/decompiler/modules/renamer/ConverterHelper.java b/src/org/jetbrains/java/decompiler/modules/renamer/ConverterHelper.java
index 5912e6e..8a431df 100644
--- a/src/org/jetbrains/java/decompiler/modules/renamer/ConverterHelper.java
+++ b/src/org/jetbrains/java/decompiler/modules/renamer/ConverterHelper.java
@@ -28,6 +28,10 @@ public class ConverterHelper implements IIdentifierRenamer {
     "protected", "throw", "byte", "extends", "instanceof", "public", "throws", "case", "false", "int", "return", "transient", "catch",
     "final", "interface", "short", "true", "char", "finally", "long", "static", "try", "class", "float", "native", "strictfp", "void",
     "const", "for", "new", "super", "volatile", "continue", "goto", "null", "switch", "while", "default", "assert", "enum"));
+  private static final Set<String> RESERVED_WINDOWS_NAMESPACE = new HashSet<String>(Arrays.asList(
+    "aux", "prn", "aux", "nul",
+    "com1", "com2", "com3", "com4", "com5", "com6", "com7", "com8", "com9",
+    "lpt1", "lpt2", "lpt3", "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9"));
 
   private int classCounter = 0;
   private int fieldCounter = 0;
@@ -37,7 +41,8 @@ public class ConverterHelper implements IIdentifierRenamer {
   @Override
   public boolean toBeRenamed(Type elementType, String className, String element, String descriptor) {
     String value = elementType == Type.ELEMENT_CLASS ? className : element;
-    return value == null || value.length() == 0 || value.length() <= 2 || KEYWORDS.contains(value) || Character.isDigit(value.charAt(0));
+    return value == null || value.length() == 0 || value.length() <= 2 || KEYWORDS.contains(value) || Character.isDigit(value.charAt(0))
+      || elementType == Type.ELEMENT_CLASS && RESERVED_WINDOWS_NAMESPACE.contains(value.toLowerCase());
   }
 
   // TODO: consider possible conflicts with not renamed classes, fields and methods!