diff --git a/platform/lang-impl/src/com/intellij/psi/search/MappedFileTypeIndex.java b/platform/lang-impl/src/com/intellij/psi/search/MappedFileTypeIndex.java
index 44a31cc4d817..f7aeadba6187 100644
--- a/platform/lang-impl/src/com/intellij/psi/search/MappedFileTypeIndex.java
+++ b/platform/lang-impl/src/com/intellij/psi/search/MappedFileTypeIndex.java
@@ -274,7 +274,6 @@ public final class MappedFileTypeIndex extends FileTypeIndexImplBase {
     private final @NotNull ResilientFileChannel myFileChannel;
     private volatile long myElementsCount;
     private volatile long myModificationsCounter = 0L;
-    private final @NotNull ByteBuffer myDataBuffer = ByteBuffer.allocate(ELEMENT_BYTES);
 
     private ForwardIndexFileControllerOverFile(@NotNull Path storage) throws StorageException {
       try {
@@ -303,11 +302,11 @@ public final class MappedFileTypeIndex extends FileTypeIndexImplBase {
 
     @Override
     public short get(int inputId) throws StorageException {
+      ByteBuffer dataBuf = ByteBuffer.allocate(ELEMENT_BYTES);
       try {
-        myDataBuffer.clear();
         int bytesLeft = ELEMENT_BYTES;
         while (bytesLeft > 0) {
-          int result = myFileChannel.read(myDataBuffer, offsetInFile(inputId) + myDataBuffer.position());
+          int result = myFileChannel.read(dataBuf, offsetInFile(inputId) + dataBuf.position());
           if (result == -1 && bytesLeft == ELEMENT_BYTES) {
             return 0; // read after EOF
           }
@@ -316,8 +315,8 @@ public final class MappedFileTypeIndex extends FileTypeIndexImplBase {
           }
           bytesLeft -= result;
         }
-        myDataBuffer.flip();
-        return myDataBuffer.getShort();
+        dataBuf.flip();
+        return dataBuf.getShort();
       }
       catch (IOException e) {
         throw closeWithException(new StorageException(e));
@@ -326,14 +325,14 @@ public final class MappedFileTypeIndex extends FileTypeIndexImplBase {
 
     @Override
     public void set(int inputId, short value) throws StorageException {
+      ByteBuffer dataBuf = ByteBuffer.allocate(ELEMENT_BYTES);
       try {
         ensureCapacity(inputId);
-        myDataBuffer.clear();
-        myDataBuffer.putShort(value);
-        myDataBuffer.flip();
+        dataBuf.putShort(value);
+        dataBuf.flip();
         int bytesWritten = 0;
         while (bytesWritten < ELEMENT_BYTES) {
-          bytesWritten += myFileChannel.write(myDataBuffer, offsetInFile(inputId) + bytesWritten);
+          bytesWritten += myFileChannel.write(dataBuf, offsetInFile(inputId) + bytesWritten);
         }
       }
       catch (IOException e) {