diff --git a/jps/jps-builders/src/org/jetbrains/jps/incremental/storage/TimestampValidityState.java b/jps/jps-builders/src/org/jetbrains/jps/incremental/storage/TimestampValidityState.java
deleted file mode 100644
index 82caa5cc06ce..000000000000
--- a/jps/jps-builders/src/org/jetbrains/jps/incremental/storage/TimestampValidityState.java
+++ /dev/null
@@ -1,53 +0,0 @@
-// Copyright 2000-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
-package org.jetbrains.jps.incremental.storage;
-
-import java.io.DataInput;
-import java.io.DataOutput;
-import java.io.IOException;
-
-/**
- * A simple implementation of ValidityState that is enough for most cases.
- * The file is considered modified if its timestamp is changed.
- */
-public final class TimestampValidityState implements ValidityState {
-  private final long myTimestamp;
-
-  /**
-   * Loads the validity state from the specified stream.
-   *
-   * @param is the stream to load the validity state from.
-   * @throws IOException if the stream read fails.
-   */
-  public TimestampValidityState(DataInput is) throws IOException{
-    myTimestamp = is.readLong();
-  }
-
-  /**
-   * Creates a validity state with the specified timestamp.
-   *
-   * @param timestamp the timestamp for the validity state.
-   */
-  public TimestampValidityState(long timestamp) {
-    myTimestamp = timestamp;
-  }
-
-  public long getTimestamp() {
-    return myTimestamp;
-  }
-
-  @Override
-  public boolean equalsTo(ValidityState otherState) {
-    return otherState instanceof TimestampValidityState && myTimestamp == ((TimestampValidityState)otherState).myTimestamp;
-  }
-
-  /**
-   * Saves the validity state to the specified stream.
-   *
-   * @param out
-   * @throws java.io.IOException if the stream write fails.
-   */
-  @Override
-  public void save(DataOutput out) throws IOException {
-    out.writeLong(myTimestamp);
-  }
-}