diff --git a/src/com/android/mms/util/ContactInfoCache.java b/src/com/android/mms/util/ContactInfoCache.java
index 72a21c6..fa7d495 100644
--- a/src/com/android/mms/util/ContactInfoCache.java
+++ b/src/com/android/mms/util/ContactInfoCache.java
@@ -106,17 +106,9 @@
 
     private final Context mContext;
 
-    private String[] mContactInfoSelectionArgs = new String[1];
-
     // cached contact info
     private final HashMap<String, CacheEntry> mCache = new HashMap<String, CacheEntry>();
 
-    // for background cache rebuilding
-    private Thread mCacheRebuilder = null;
-    private Object mCacheRebuildLock = new Object();
-    private boolean mPhoneCacheInvalidated = false;
-    private boolean mEmailCacheInvalidated = false;
-
     /**
      * CacheEntry stores the caller id or email lookup info.
      */
@@ -294,7 +286,8 @@
 
         //if (LOCAL_DEBUG) log("queryContactInfoByNumber: number=" + number);
 
-        mContactInfoSelectionArgs[0] = number;
+        String contactInfoSelectionArgs[] = new String[1];
+        contactInfoSelectionArgs[0] = number;
 
         // We need to include the phone number in the selection string itself rather then
         // selection arguments, because SQLite needs to see the exact pattern of GLOB
@@ -305,7 +298,7 @@
                 PHONES_WITH_PRESENCE_URI,
                 CALLER_ID_PROJECTION,
                 selection,
-                mContactInfoSelectionArgs,
+                contactInfoSelectionArgs,
                 null);
 
         if (cursor == null) {
@@ -476,13 +469,14 @@
     private CacheEntry queryEmailDisplayName(String email) {
         CacheEntry entry = new CacheEntry();
 
-        mContactInfoSelectionArgs[0] = email;
+        String contactInfoSelectionArgs[] = new String[1];
+        contactInfoSelectionArgs[0] = email;
 
         Cursor cursor = SqliteWrapper.query(mContext, mContext.getContentResolver(),
                 EMAIL_WITH_PRESENCE_URI,
                 EMAIL_PROJECTION,
                 EMAIL_SELECTION,
-                mContactInfoSelectionArgs,
+                contactInfoSelectionArgs,
                 null);
 
         if (cursor != null) {