diff --git a/java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightControlFlowUtil.java b/java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightControlFlowUtil.java
index f6269f9b56e6..60b233d4e32f 100644
--- a/java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightControlFlowUtil.java
+++ b/java/java-impl/src/com/intellij/codeInsight/daemon/impl/analysis/HighlightControlFlowUtil.java
@@ -25,6 +25,7 @@ import com.intellij.openapi.project.IndexNotReadyException;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.psi.*;
 import com.intellij.psi.controlFlow.*;
+import com.intellij.psi.impl.PsiImplUtil;
 import com.intellij.psi.tree.IElementType;
 import com.intellij.psi.util.PsiMatcherImpl;
 import com.intellij.psi.util.PsiMatchers;
@@ -433,7 +434,7 @@ public class HighlightControlFlowUtil {
     }
     else if (variable instanceof PsiParameter) {
       final PsiParameter parameter = (PsiParameter)variable;
-      return PsiUtil.isAssigned(parameter);
+      return PsiImplUtil.isAssigned(parameter);
     }
     else {
       return false;
diff --git a/java/java-impl/src/com/intellij/psi/impl/PsiImplUtil.java b/java/java-impl/src/com/intellij/psi/impl/PsiImplUtil.java
index 4b128cf8a827..8724eb5dc03d 100644
--- a/java/java-impl/src/com/intellij/psi/impl/PsiImplUtil.java
+++ b/java/java-impl/src/com/intellij/psi/impl/PsiImplUtil.java
@@ -39,10 +39,12 @@ import com.intellij.psi.search.GlobalSearchScope;
 import com.intellij.psi.search.LocalSearchScope;
 import com.intellij.psi.search.PackageScope;
 import com.intellij.psi.search.SearchScope;
+import com.intellij.psi.search.searches.ReferencesSearch;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.psi.util.PsiUtil;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.PairFunction;
+import com.intellij.util.Processor;
 import com.intellij.util.SmartList;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
@@ -439,4 +441,26 @@ public class PsiImplUtil {
                                                      @NotNull PairFunction<Project, String, PsiAnnotation> annotationCreator) {
     return annotationCreator.fun(value.getProject(), "@A(" + namePrefix + value.getText() + ")").getParameterList().getAttributes()[0];
   }
+
+  public static boolean isAssigned(final PsiParameter parameter) {
+    ParamWriteProcessor processor = new ParamWriteProcessor();
+    ReferencesSearch.search(parameter, new LocalSearchScope(parameter.getDeclarationScope()), true).forEach(processor);
+    return processor.isWriteRefFound();
+  }
+
+  private static class ParamWriteProcessor implements Processor<PsiReference> {
+    private volatile boolean myIsWriteRefFound = false;
+    public boolean process(PsiReference reference) {
+      final PsiElement element = reference.getElement();
+      if (element instanceof PsiReferenceExpression && PsiUtil.isAccessedForWriting((PsiExpression)element)) {
+        myIsWriteRefFound = true;
+        return false;
+      }
+      return true;
+    }
+
+    public boolean isWriteRefFound() {
+      return myIsWriteRefFound;
+    }
+  }
 }
diff --git a/java/java-impl/src/com/intellij/usages/impl/rules/JavaUsageTypeProvider.java b/java/java-impl/src/com/intellij/usages/impl/rules/JavaUsageTypeProvider.java
index 2c442e3b4530..8c8651a49f81 100644
--- a/java/java-impl/src/com/intellij/usages/impl/rules/JavaUsageTypeProvider.java
+++ b/java/java-impl/src/com/intellij/usages/impl/rules/JavaUsageTypeProvider.java
@@ -16,9 +16,9 @@
 package com.intellij.usages.impl.rules;
 
 import com.intellij.psi.*;
+import com.intellij.psi.impl.PsiImplUtil;
 import com.intellij.psi.impl.PsiSuperMethodImplUtil;
 import com.intellij.psi.util.PsiTreeUtil;
-import com.intellij.psi.util.PsiUtil;
 import com.intellij.util.Processor;
 import gnu.trove.THashSet;
 import org.jetbrains.annotations.NotNull;
@@ -91,7 +91,7 @@ public class JavaUsageTypeProvider implements UsageTypeProvider {
     }
 
     for (PsiParameter parameter : parameters) {
-      if (PsiUtil.isAssigned(parameter)) return false;
+      if (PsiImplUtil.isAssigned(parameter)) return false;
     }
 
     return true;
diff --git a/java/openapi/src/com/intellij/psi/util/PsiUtil.java b/java/openapi/src/com/intellij/psi/util/PsiUtil.java
index 590eb3338761..d21fee46b4a6 100644
--- a/java/openapi/src/com/intellij/psi/util/PsiUtil.java
+++ b/java/openapi/src/com/intellij/psi/util/PsiUtil.java
@@ -654,28 +654,6 @@ public final class PsiUtil extends PsiUtilCore {
            : Collections.singletonList(typeElement);
   }
 
-  private static class ParamWriteProcessor implements Processor<PsiReference> {
-    private volatile boolean myIsWriteRefFound = false;
-    public boolean process(PsiReference reference) {
-      final PsiElement element = reference.getElement();
-      if (element instanceof PsiReferenceExpression && isAccessedForWriting((PsiExpression)element)) {
-        myIsWriteRefFound = true;
-        return false;
-      }
-      return true;
-    }
-
-    public boolean isWriteRefFound() {
-      return myIsWriteRefFound;
-    }
-  }
-
-  public static boolean isAssigned(final PsiParameter parameter) {
-    ParamWriteProcessor processor = new ParamWriteProcessor();
-    ReferencesSearch.search(parameter, new LocalSearchScope(parameter.getDeclarationScope()), true).forEach(processor);
-    return processor.isWriteRefFound();
-  }
-
   public static void checkIsIdentifier(PsiManager manager, String text) throws IncorrectOperationException{
     if (!JavaPsiFacade.getInstance(manager.getProject()).getNameHelper().isIdentifier(text)){
       throw new IncorrectOperationException(PsiBundle.message("0.is.not.an.identifier", text) );