diff --git a/java/src/com/android/inputmethod/research/ResearchLogDirectory.java b/java/src/com/android/inputmethod/research/ResearchLogDirectory.java
index 291dea5d0..d156068d6 100644
--- a/java/src/com/android/inputmethod/research/ResearchLogDirectory.java
+++ b/java/src/com/android/inputmethod/research/ResearchLogDirectory.java
@@ -97,15 +97,17 @@ public class ResearchLogDirectory {
         }
     }
 
-    public File getLogFilePath(final long time) {
-        return new File(mFilesDir, getUniqueFilename(LOG_FILENAME_PREFIX, time));
+    public File getLogFilePath(final long time, final long nanoTime) {
+        return new File(mFilesDir, getUniqueFilename(LOG_FILENAME_PREFIX, time, nanoTime));
     }
 
-    public File getUserRecordingFilePath(final long time) {
-        return new File(mFilesDir, getUniqueFilename(USER_RECORDING_FILENAME_PREFIX, time));
+    public File getUserRecordingFilePath(final long time, final long nanoTime) {
+        return new File(mFilesDir, getUniqueFilename(USER_RECORDING_FILENAME_PREFIX, time,
+                nanoTime));
     }
 
-    private static String getUniqueFilename(final String prefix, final long time) {
-        return prefix + "-" + time + FILENAME_SUFFIX;
+    private static String getUniqueFilename(final String prefix, final long time,
+            final long nanoTime) {
+        return prefix + "-" + time + "-" + nanoTime + FILENAME_SUFFIX;
     }
 }
diff --git a/java/src/com/android/inputmethod/research/ResearchLogger.java b/java/src/com/android/inputmethod/research/ResearchLogger.java
index 7a23ddb05..d764ad5a3 100644
--- a/java/src/com/android/inputmethod/research/ResearchLogger.java
+++ b/java/src/com/android/inputmethod/research/ResearchLogger.java
@@ -389,7 +389,7 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
         }
         if (mMainLogBuffer == null) {
             mMainResearchLog = new ResearchLog(mResearchLogDirectory.getLogFilePath(
-                    System.currentTimeMillis()), mLatinIME);
+                    System.currentTimeMillis(), System.nanoTime()), mLatinIME);
             final int numWordsToIgnore = new Random().nextInt(NUMBER_OF_WORDS_BETWEEN_SAMPLES + 1);
             mMainLogBuffer = new MainLogBuffer(NUMBER_OF_WORDS_BETWEEN_SAMPLES, numWordsToIgnore,
                     mSuggest) {
@@ -420,7 +420,7 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
 
     private void resetFeedbackLogging() {
         mFeedbackLog = new ResearchLog(mResearchLogDirectory.getLogFilePath(
-                System.currentTimeMillis()), mLatinIME);
+                System.currentTimeMillis(), System.nanoTime()), mLatinIME);
         mFeedbackLogBuffer = new FixedLogBuffer(FEEDBACK_WORD_BUFFER_SIZE);
     }
 
@@ -545,7 +545,7 @@ public class ResearchLogger implements SharedPreferences.OnSharedPreferenceChang
             mUserRecordingLog.blockingAbort(RESEARCHLOG_ABORT_TIMEOUT_IN_MS);
         }
         mUserRecordingFile = mResearchLogDirectory.getUserRecordingFilePath(
-                System.currentTimeMillis());
+                System.currentTimeMillis(), System.nanoTime());
         mUserRecordingLog = new ResearchLog(mUserRecordingFile, mLatinIME);
         mUserRecordingLogBuffer = new LogBuffer();
         resetRecordingTimer();