diff --git a/MyTracks/src/com/google/android/apps/mytracks/services/PreferenceManager.java b/MyTracks/src/com/google/android/apps/mytracks/services/PreferenceManager.java
index a6a260852..413ddb364 100644
--- a/MyTracks/src/com/google/android/apps/mytracks/services/PreferenceManager.java
+++ b/MyTracks/src/com/google/android/apps/mytracks/services/PreferenceManager.java
@@ -189,7 +189,6 @@ public class PreferenceManager implements OnSharedPreferenceChangeListener {
   
   public void shutdown() {
     sharedPreferences.unregisterOnSharedPreferenceChangeListener(this);
-    sharedPreferences = null;
     service = null;
   }
 }