diff --git a/default.properties b/default.properties
index e2e8061..66db0d1 100644
--- a/default.properties
+++ b/default.properties
@@ -8,4 +8,4 @@
 # project structure.
 
 # Project target.
-target=android-8
+target=android-10
diff --git a/src/de/schatenseite/android/waldemar/WaldemarPreferences.java b/src/de/schatenseite/android/waldemar/WaldemarPreferences.java
index ceaebd9..e6f5df4 100644
--- a/src/de/schatenseite/android/waldemar/WaldemarPreferences.java
+++ b/src/de/schatenseite/android/waldemar/WaldemarPreferences.java
@@ -11,7 +11,8 @@ import android.preference.PreferenceManager;
 import de.schatenseite.android.datepreference.DatePreference;
 
 public class WaldemarPreferences extends PreferenceActivity {
-	public static final String PREFERENCES_UPDATED = "PREFERENCES_UPDATED";
+	private static final String PREFIX = WaldemarPreferences.class.getPackage().getName() + ".";
+	public static final String PREFERENCES_UPDATED = PREFIX + "PREFERENCES_UPDATED";
 	int widgetId;
 	public void enableDisablePreferences(String val) {
 		EditTextPreference pref_name = (EditTextPreference)findPreference("pref_name");
diff --git a/src/de/schatenseite/android/waldemar/WaldemarWidget.java b/src/de/schatenseite/android/waldemar/WaldemarWidget.java
index 43a6a5d..029245f 100644
--- a/src/de/schatenseite/android/waldemar/WaldemarWidget.java
+++ b/src/de/schatenseite/android/waldemar/WaldemarWidget.java
@@ -24,7 +24,8 @@ import android.widget.RemoteViews;
 import de.schatenseite.android.datepreference.DatePreference;
 
 public class WaldemarWidget extends AppWidgetProvider {
-	public static final String MIDNIGHTLY_WIDGET_UPDATE = "MIDNIGHTLY_WIDGET_UPDATE";
+	private static final String PREFIX = WaldemarWidget.class.getPackage().getName() + ".";
+	public static final String MIDNIGHTLY_WIDGET_UPDATE = PREFIX + "MIDNIGHTLY_WIDGET_UPDATE";
 	private static final double SECONDS_PER_DAY = 24 * 60 * 60;                                                                                                        
 	private static final double MILLISECONDS_PER_DAY = SECONDS_PER_DAY * 1000;                                                                                         
 	private static final int CURRENTLY_NOT_USED_REQUEST_CODE = 0;