Index: trunk/src/org/openstreetmap/josm/actions/CloseChangesetAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/CloseChangesetAction.java	(revision 9514)
+++ trunk/src/org/openstreetmap/josm/actions/CloseChangesetAction.java	(revision 9519)
@@ -55,5 +55,5 @@
 
     protected void onPostDownloadOpenChangesets() {
-        List<Changeset> openChangesets = ChangesetCache.getInstance().getOpenChangesets();
+        List<Changeset> openChangesets = ChangesetCache.getInstance().getOpenChangesetsForCurrentUser();
         if (openChangesets.isEmpty()) {
             JOptionPane.showMessageDialog(
Index: trunk/src/org/openstreetmap/josm/data/osm/ChangesetCache.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/osm/ChangesetCache.java	(revision 9514)
+++ trunk/src/org/openstreetmap/josm/data/osm/ChangesetCache.java	(revision 9519)
@@ -14,5 +14,8 @@
 import org.openstreetmap.josm.data.Preferences.PreferenceChangeEvent;
 import org.openstreetmap.josm.data.Preferences.PreferenceChangedListener;
+import org.openstreetmap.josm.gui.JosmUserIdentityManager;
 import org.openstreetmap.josm.gui.util.GuiHelper;
+import org.openstreetmap.josm.tools.Predicate;
+import org.openstreetmap.josm.tools.Utils;
 
 /**
@@ -192,4 +195,24 @@
     }
 
+    /**
+     * If the current user {@link JosmUserIdentityManager#isAnonymous() is known}, the {@link #getOpenChangesets() open changesets}
+     * for the {@link JosmUserIdentityManager#isCurrentUser(User) current user} are returned. Otherwise,
+     * the unfiltered {@link #getOpenChangesets() open changesets} are returned.
+     *
+     * @return a list of changesets
+     */
+    public List<Changeset> getOpenChangesetsForCurrentUser() {
+        if (JosmUserIdentityManager.getInstance().isAnonymous()) {
+            return getOpenChangesets();
+        } else {
+            return new ArrayList<>(Utils.filter(getOpenChangesets(), new Predicate<Changeset>() {
+                @Override
+                public boolean evaluate(Changeset object) {
+                    return JosmUserIdentityManager.getInstance().isCurrentUser(object.getUser());
+                }
+            }));
+        }
+    }
+
     /* ------------------------------------------------------------------------- */
     /* interface PreferenceChangedListener                                       */
Index: trunk/src/org/openstreetmap/josm/gui/JosmUserIdentityManager.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/JosmUserIdentityManager.java	(revision 9514)
+++ trunk/src/org/openstreetmap/josm/gui/JosmUserIdentityManager.java	(revision 9519)
@@ -10,4 +10,5 @@
 import org.openstreetmap.josm.data.Preferences.PreferenceChangedListener;
 import org.openstreetmap.josm.data.Preferences.StringSetting;
+import org.openstreetmap.josm.data.osm.User;
 import org.openstreetmap.josm.data.osm.UserInfo;
 import org.openstreetmap.josm.gui.preferences.server.OAuthAccessTokenHolder;
@@ -223,14 +224,28 @@
 
     /**
-     * Replies true if the user with name <code>username</code> is the current
-     * user
+     * Replies true if the user with name <code>username</code> is the current user
      *
      * @param username the user name
-     * @return true if the user with name <code>username</code> is the current
-     * user
+     * @return true if the user with name <code>username</code> is the current user
      */
     public boolean isCurrentUser(String username) {
-        if (username == null || this.userName == null) return false;
-        return this.userName.equals(username);
+        return username != null && this.userName != null && this.userName.equals(username);
+    }
+
+    /**
+     * Replies true if the current user is {@link #isFullyIdentified() fully identified} and the {@link #getUserId() user ids} match,
+     * or if the current user is not {@link #isFullyIdentified() fully identified} and the {@link #userName user names} match.
+     *
+     * @param user the user to test
+     * @return true if given user is the current user
+     */
+    public boolean isCurrentUser(User user) {
+        if (user == null) {
+            return false;
+        } else if (isFullyIdentified()) {
+            return getUserId() == user.getId();
+        } else {
+            return isCurrentUser(user.getName());
+        }
     }
 
Index: trunk/src/org/openstreetmap/josm/gui/io/OpenChangesetComboBoxModel.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/io/OpenChangesetComboBoxModel.java	(revision 9514)
+++ trunk/src/org/openstreetmap/josm/gui/io/OpenChangesetComboBoxModel.java	(revision 9519)
@@ -41,5 +41,5 @@
     public void refresh() {
         changesets.clear();
-        changesets.addAll(ChangesetCache.getInstance().getOpenChangesets());
+        changesets.addAll(ChangesetCache.getInstance().getOpenChangesetsForCurrentUser());
         fireContentsChanged(this, 0, getSize());
         int idx = changesets.indexOf(selectedChangeset);