diff --git a/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpPosixBracketExpressionImpl.java b/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpPosixBracketExpressionImpl.java
index 97bb04d0e028..e46593b2c44c 100644
--- a/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpPosixBracketExpressionImpl.java
+++ b/RegExpSupport/src/org/intellij/lang/regexp/psi/impl/RegExpPosixBracketExpressionImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,11 +16,9 @@
 package org.intellij.lang.regexp.psi.impl;
 
 import com.intellij.lang.ASTNode;
-import com.intellij.psi.PsiElementVisitor;
 import org.intellij.lang.regexp.RegExpTT;
 import org.intellij.lang.regexp.psi.RegExpElementVisitor;
 import org.intellij.lang.regexp.psi.RegExpPosixBracketExpression;
-import org.jetbrains.annotations.NotNull;
 
 /**
  * @author Bas Leijdekkers
@@ -39,5 +37,6 @@ public class RegExpPosixBracketExpressionImpl extends RegExpElementImpl implemen
   @Override
   public String getClassName() {
     final ASTNode nameNode = getNode().findChildByType(RegExpTT.NAME);
-    return nameNode != null ? nameNode.getText() : null;  }
+    return nameNode != null ? nameNode.getText() : null;
+  }
 }
diff --git a/RegExpSupport/src/org/intellij/lang/regexp/validation/RegExpAnnotator.java b/RegExpSupport/src/org/intellij/lang/regexp/validation/RegExpAnnotator.java
index f713f6e6e638..d304053d9ace 100644
--- a/RegExpSupport/src/org/intellij/lang/regexp/validation/RegExpAnnotator.java
+++ b/RegExpSupport/src/org/intellij/lang/regexp/validation/RegExpAnnotator.java
@@ -380,8 +380,11 @@ public final class RegExpAnnotator extends RegExpElementVisitor implements Annot
   public void visitPosixBracketExpression(RegExpPosixBracketExpression posixBracketExpression) {
     final String className = posixBracketExpression.getClassName();
     if (!POSIX_CHARACTER_CLASSES.contains(className)) {
-      final Annotation annotation = myHolder.createErrorAnnotation(posixBracketExpression, "Unknown POSIX character class");
-      annotation.setHighlightType(ProblemHighlightType.LIKE_UNKNOWN_SYMBOL);
+      final ASTNode node = posixBracketExpression.getNode().findChildByType(RegExpTT.NAME);
+      if (node != null) {
+        final Annotation annotation = myHolder.createErrorAnnotation(node, "Unknown POSIX character class");
+        annotation.setHighlightType(ProblemHighlightType.LIKE_UNKNOWN_SYMBOL);
+      }
     }
   }