Index: /trunk/src/org/openstreetmap/josm/gui/layer/NoteLayer.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/layer/NoteLayer.java	(revision 10639)
+++ /trunk/src/org/openstreetmap/josm/gui/layer/NoteLayer.java	(revision 10640)
@@ -188,5 +188,5 @@
     @Override
     public String getToolTipText() {
-        return noteData.getNotes().size() + ' ' + tr("Notes");
+        return noteData.getNotes().size() + " " + tr("Notes");
     }
 
Index: /trunk/test/unit/org/openstreetmap/josm/gui/layer/NoteLayerTest.java
===================================================================
--- /trunk/test/unit/org/openstreetmap/josm/gui/layer/NoteLayerTest.java	(revision 10640)
+++ /trunk/test/unit/org/openstreetmap/josm/gui/layer/NoteLayerTest.java	(revision 10640)
@@ -0,0 +1,30 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.layer;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+
+/**
+ * Unit tests of {@link NoteLayer} class.
+ */
+public class NoteLayerTest {
+
+    /**
+     * Setup tests
+     */
+    @BeforeClass
+    public static void setUpBeforeClass() {
+        JOSMFixture.createUnitTestFixture().init();
+    }
+
+    /**
+     * Non-regression test for ticket <a href="https://josm.openstreetmap.de/ticket/13208">#13208</a>.
+     */
+    @Test
+    public void testTicket13208() {
+        assertEquals("0 Notes", new NoteLayer().getToolTipText());
+    }
+}