diff --git a/java/src/com/android/inputmethod/latin/SuggestedWords.java b/java/src/com/android/inputmethod/latin/SuggestedWords.java
index 390b311e2..30dd51aed 100644
--- a/java/src/com/android/inputmethod/latin/SuggestedWords.java
+++ b/java/src/com/android/inputmethod/latin/SuggestedWords.java
@@ -27,7 +27,6 @@ import com.android.inputmethod.latin.define.DebugFlags;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
-import java.util.Locale;
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtils.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtils.java
index 84c3956f7..b5ed94ccd 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtils.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtils.java
@@ -37,8 +37,6 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
-import java.util.Arrays;
-import java.util.ArrayList;
 import java.util.HashMap;
 
 import javax.annotation.Nonnull;
diff --git a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Header.java b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Header.java
index ba96c0aeb..aa1762ff1 100644
--- a/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Header.java
+++ b/tools/dicttool/src/com/android/inputmethod/latin/dicttool/Header.java
@@ -16,14 +16,12 @@
 
 package com.android.inputmethod.latin.dicttool;
 
-import com.android.inputmethod.latin.BinaryDictionary;
 import com.android.inputmethod.latin.dicttool.BinaryDictOffdeviceUtils.DecoderChainSpec;
 import com.android.inputmethod.latin.makedict.DictionaryHeader;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
 
 import java.io.File;
 import java.util.Arrays;
-import java.util.Locale;
 
 public class Header extends Dicttool.Command {
     public static final String COMMAND = "header";
diff --git a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
index ea9d4cc19..e68aeb0eb 100644
--- a/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
+++ b/tools/dicttool/tests/com/android/inputmethod/latin/dicttool/BinaryDictOffdeviceUtilsTests.java
@@ -154,7 +154,6 @@ public class BinaryDictOffdeviceUtilsTests extends TestCase {
     public void runTestHeaderReaderProcessorWithOneSpec(final boolean compress, final boolean crypt)
             throws IOException, UnsupportedFormatException {
         final String dictName = "testHeaderReaderProcessor";
-        final String dictVersion = Long.toString(System.currentTimeMillis());
         final FormatOptions formatOptions = BinaryDictUtils.STATIC_OPTIONS;
         final int MAX_NUMBER_OF_OPTIONS_TO_ADD = 5;
         final HashMap<String, String> options = new HashMap<>();