SQLiteException near "<" while delete query

I am trying to delete a few rows from my SQLite database like this:

dbUtilsObj.delete(EngineUtiReport.TABLE_NAME, 
    EngineUtiReport.Columns.KEY_ENGINE_UTI_UNIX_TIME + DBUtils.IS_LESS_THAN,
    new String[] { String.valueOf(nDaysOldUnixTime) });

In the above code nDayOldTimeInMills = 1429963811949 and DBUtils.IS_LESS_THAN = " < ".

But I am getting this syntax error exception and I just can't figure out what I am doing wrong:

android.database.sqlite.SQLiteException: near "<": syntax error (code 1): , 
while compiling: DELETE FROM engine_utilization_report WHERE unix_time <
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1113)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:686)