diff --git a/pom.xml b/pom.xml
index bb628dd..5c955cc 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
   <groupId>org.openconext</groupId>
   <artifactId>voot-service</artifactId>
-  <version>6.1.0-SNAPSHOT</version>
+  <version>6.1.0</version>
   <packaging>jar</packaging>
 
   <name>voot-service</name>
diff --git a/src/main/java/voot/provider/InviteProvider.java b/src/main/java/voot/provider/InviteProvider.java
index d8ad00a..fa5a11f 100644
--- a/src/main/java/voot/provider/InviteProvider.java
+++ b/src/main/java/voot/provider/InviteProvider.java
@@ -21,7 +21,7 @@ public class InviteProvider extends AbstractProvider {
 
     public InviteProvider(Configuration configuration) {
         super(configuration);
-        groupMembershipsUrlTemplate = "%s/api/voot/%s";
+        groupMembershipsUrlTemplate = String.format("%s", configuration.url.endsWith("/") ? configuration.url : (configuration.url + "/"));
     }
 
     @Override
@@ -39,7 +39,7 @@ public boolean isExternalGroupProvider() {
     public Set<Group> getGroupMemberships(String uid) {
         LOG.debug("Calling getGroupMemberships for " + uid);
 
-        String uri = String.format(groupMembershipsUrlTemplate, configuration.url, uid);
+        String uri = groupMembershipsUrlTemplate + uid;
         RequestEntity<List<Map<String, String>>> requestEntity = new RequestEntity<>(HttpMethod.GET, URI.create(uri));
         return restTemplate.exchange(requestEntity, new ParameterizedTypeReference<List<Map<String, String>>>() {
         }).getBody().stream()
diff --git a/src/test/java/voot/provider/InviteProviderTest.java b/src/test/java/voot/provider/InviteProviderTest.java
index b70f9a4..2d356e7 100644
--- a/src/test/java/voot/provider/InviteProviderTest.java
+++ b/src/test/java/voot/provider/InviteProviderTest.java
@@ -17,7 +17,7 @@
 class InviteProviderTest extends AbstractTest {
 
     private final InviteProvider subject = new InviteProvider(
-            new Provider.Configuration(GroupProviderType.INVITE, "http://localhost:8889",
+            new Provider.Configuration(GroupProviderType.INVITE, "http://localhost:8889/api/external/v1/voot",
                     new Provider.Configuration.Credentials("user", "password"),
                     2000, "N/A", "invite"));
 
@@ -25,7 +25,7 @@ class InviteProviderTest extends AbstractTest {
     void getGroupMemberships() throws IOException {
         String json = IOUtils.readInputStreamToString(new ClassPathResource("json/invite/group_memberships.json").getInputStream());
         String urn = "urn:collab:person:example.com:admin";
-        stubFor(get(urlPathEqualTo("/api/voot/" + urn))
+        stubFor(get(urlPathEqualTo("/api/external/v1/voot/" + urn))
                 .willReturn(aResponse()
                         .withStatus(200)
                         .withHeader("Content-type", "application/json").
@@ -34,6 +34,23 @@ void getGroupMemberships() throws IOException {
         assertEquals(2, groupMemberships.size());
     }
 
+    @Test
+    void getGroupMembershipsMissingSlash() throws IOException {
+        InviteProvider inviteProvider = new InviteProvider(
+                new Provider.Configuration(GroupProviderType.INVITE, "http://localhost:8889/api/voot/",
+                        new Provider.Configuration.Credentials("user", "password"),
+                        2000, "N/A", "invite"));
+        String json = IOUtils.readInputStreamToString(new ClassPathResource("json/invite/group_memberships.json").getInputStream());
+        String urn = "urn:collab:person:example.com:admin";
+        stubFor(get(urlPathEqualTo("/api/voot/" + urn))
+                .willReturn(aResponse()
+                        .withStatus(200)
+                        .withHeader("Content-type", "application/json").
+                        withBody(json)));
+        Set<Group> groupMemberships = inviteProvider.getGroupMemberships(urn);
+        assertEquals(2, groupMemberships.size());
+    }
+
     @Test
     void getAllGroups() {
         assertEquals(0, subject.getAllGroups().size());