Index: /trunk/src/org/openstreetmap/josm/data/validation/util/MultipleNameVisitor.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/data/validation/util/MultipleNameVisitor.java	(revision 8872)
+++ /trunk/src/org/openstreetmap/josm/data/validation/util/MultipleNameVisitor.java	(revision 8873)
@@ -63,12 +63,14 @@
             displayName = name;
         } else {
-            displayName = size + ' ' + trn(multipleClassname, multiplePluralClassname, size);
+            StringBuilder sb = new StringBuilder().append(size).append(' ').append(trn(multipleClassname, multiplePluralClassname, size));
             if (multipleName.length() > 0) {
+                sb.append(": ");
                 if (multipleName.length() <= MULTIPLE_NAME_MAX_LENGTH) {
-                    displayName += ": " + multipleName;
+                    sb.append(multipleName);
                 } else {
-                    displayName += ": " + multipleName.substring(0, MULTIPLE_NAME_MAX_LENGTH) + "...";
+                    sb.append(multipleName.substring(0, MULTIPLE_NAME_MAX_LENGTH)).append("...");
                 }
             }
+            displayName = sb.toString();
         }
     }
Index: /trunk/test/unit/org/openstreetmap/josm/data/validation/util/MultipleNameVisitorTest.java
===================================================================
--- /trunk/test/unit/org/openstreetmap/josm/data/validation/util/MultipleNameVisitorTest.java	(revision 8873)
+++ /trunk/test/unit/org/openstreetmap/josm/data/validation/util/MultipleNameVisitorTest.java	(revision 8873)
@@ -0,0 +1,35 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.data.validation.util;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.openstreetmap.josm.JOSMFixture;
+import org.openstreetmap.josm.data.osm.Way;
+
+/**
+ * Unit tests for class {@link MultipleNameVisitor}.
+ */
+public class MultipleNameVisitorTest {
+
+    /**
+     * Setup test.
+     */
+    @BeforeClass
+    public static void setUp() {
+        JOSMFixture.createUnitTestFixture().init();
+    }
+
+    /**
+     * Non-regression test for bug #11967.
+     */
+    @Test
+    public void testTicket11967() {
+        MultipleNameVisitor visitor = new MultipleNameVisitor();
+        visitor.visit(Arrays.asList(new Way(), new Way()));
+        assertEquals("2 ways", visitor.toString());
+    }
+}