diff --git a/src/java/davmail/caldav/CaldavConnection.java b/src/java/davmail/caldav/CaldavConnection.java
index 5d029b33..34d7d230 100644
--- a/src/java/davmail/caldav/CaldavConnection.java
+++ b/src/java/davmail/caldav/CaldavConnection.java
@@ -924,6 +924,10 @@ public class CaldavConnection extends AbstractConnection {
         response.startResponse(URIUtil.encodePath("/principals/" + prefix + '/' + principal));
         response.startPropstat();
 
+        if (request.hasProperty("principal-URL")) {
+            response.appendProperty("D:principal-URL", "/principals/" + prefix + '/' + principal);
+        }
+
         if (request.hasProperty("calendar-home-set")) {
             if ("users".equals(prefix)) {
                 response.appendHrefProperty("C:calendar-home-set", "/users/" + actualPrincipal + "/calendar/");
diff --git a/src/test/davmail/caldav/TestCaldav.java b/src/test/davmail/caldav/TestCaldav.java
index 4cf09d5f..6b064a78 100644
--- a/src/test/davmail/caldav/TestCaldav.java
+++ b/src/test/davmail/caldav/TestCaldav.java
@@ -350,5 +350,13 @@ public class TestCaldav extends AbstractDavMailTestCase {
         assertEquals(HttpStatus.SC_MOVED_PERMANENTLY, method.getStatusCode());
     }
 
+    public void testPrincipalUrl() throws IOException, DavException {
+        DavPropertyNameSet davPropertyNameSet = new DavPropertyNameSet();
+        davPropertyNameSet.add(DavPropertyName.create("principal-URL", Namespace.getNamespace("DAV:")));
+        PropFindMethod method = new PropFindMethod("/principals/users/"+session.getEmail(), davPropertyNameSet, 0);
+        httpClient.executeMethod(method);
+        method.getResponseBodyAsMultiStatus();
+        assertEquals(HttpStatus.SC_MULTI_STATUS, method.getStatusCode());
+    }
 
 }