diff --git a/apis/openstack-keystone/src/main/java/org/jclouds/openstack/keystone/v2_0/config/KeystoneRestClientModule.java b/apis/openstack-keystone/src/main/java/org/jclouds/openstack/keystone/v2_0/config/KeystoneRestClientModule.java
index 7904ba0dda..6d265cacbf 100644
--- a/apis/openstack-keystone/src/main/java/org/jclouds/openstack/keystone/v2_0/config/KeystoneRestClientModule.java
+++ b/apis/openstack-keystone/src/main/java/org/jclouds/openstack/keystone/v2_0/config/KeystoneRestClientModule.java
@@ -51,6 +51,7 @@ import org.jclouds.openstack.v2_0.ServiceType;
 import org.jclouds.openstack.v2_0.domain.Extension;
 import org.jclouds.openstack.v2_0.features.ExtensionApi;
 import org.jclouds.openstack.v2_0.features.ExtensionAsyncApi;
+import org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet;
 import org.jclouds.openstack.v2_0.services.Identity;
 import org.jclouds.rest.ConfiguresRestClient;
 import org.jclouds.rest.annotations.ApiVersion;
@@ -123,6 +124,12 @@ public class KeystoneRestClientModule<S extends KeystoneApi, A extends KeystoneA
          return whenIdentityServiceHasNoAdminURLFallbackToProviderURI;
       }
    }
+
+   @Override
+   protected void configure() {
+      bind(ImplicitOptionalConverter.class).to(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.class);
+      super.configure();
+   }
    
    @Provides
    @Singleton
diff --git a/apis/openstack-nova/src/main/java/org/jclouds/openstack/nova/v2_0/config/NovaRestClientModule.java b/apis/openstack-nova/src/main/java/org/jclouds/openstack/nova/v2_0/config/NovaRestClientModule.java
index 9783e3cb04..0bef0894e7 100644
--- a/apis/openstack-nova/src/main/java/org/jclouds/openstack/nova/v2_0/config/NovaRestClientModule.java
+++ b/apis/openstack-nova/src/main/java/org/jclouds/openstack/nova/v2_0/config/NovaRestClientModule.java
@@ -126,8 +126,7 @@ public class NovaRestClientModule<S extends NovaApi, A extends NovaAsyncApi> ext
    @Override
    protected void configure() {
       install(new NovaParserModule());
-      bind(ImplicitOptionalConverter.class).to(
-            PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.class);
+      bind(ImplicitOptionalConverter.class).to(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.class);
       super.configure();
    }
    
diff --git a/labs/openstack-glance/src/main/java/org/jclouds/openstack/glance/v1_0/config/GlanceRestClientModule.java b/labs/openstack-glance/src/main/java/org/jclouds/openstack/glance/v1_0/config/GlanceRestClientModule.java
index 7234f344f6..e6d266a052 100644
--- a/labs/openstack-glance/src/main/java/org/jclouds/openstack/glance/v1_0/config/GlanceRestClientModule.java
+++ b/labs/openstack-glance/src/main/java/org/jclouds/openstack/glance/v1_0/config/GlanceRestClientModule.java
@@ -40,8 +40,10 @@ import org.jclouds.openstack.glance.v1_0.handlers.GlanceErrorHandler;
 import org.jclouds.openstack.v2_0.domain.Extension;
 import org.jclouds.openstack.v2_0.features.ExtensionApi;
 import org.jclouds.openstack.v2_0.features.ExtensionAsyncApi;
+import org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet;
 import org.jclouds.rest.ConfiguresRestClient;
 import org.jclouds.rest.config.RestClientModule;
+import org.jclouds.rest.functions.ImplicitOptionalConverter;
 
 import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
@@ -76,6 +78,7 @@ public class GlanceRestClientModule<S extends GlanceApi, A extends GlanceAsyncAp
    @Override
    protected void configure() {
       bind(DateAdapter.class).to(Iso8601DateAdapter.class);
+      bind(ImplicitOptionalConverter.class).to(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.class);
       super.configure();
    }
    
diff --git a/labs/openstack-quantum/src/main/java/org/jclouds/openstack/quantum/v1_0/config/QuantumRestClientModule.java b/labs/openstack-quantum/src/main/java/org/jclouds/openstack/quantum/v1_0/config/QuantumRestClientModule.java
index c82d0fb2d5..4b7be5ba64 100644
--- a/labs/openstack-quantum/src/main/java/org/jclouds/openstack/quantum/v1_0/config/QuantumRestClientModule.java
+++ b/labs/openstack-quantum/src/main/java/org/jclouds/openstack/quantum/v1_0/config/QuantumRestClientModule.java
@@ -42,8 +42,10 @@ import org.jclouds.openstack.quantum.v1_0.handlers.QuantumErrorHandler;
 import org.jclouds.openstack.v2_0.domain.Extension;
 import org.jclouds.openstack.v2_0.features.ExtensionApi;
 import org.jclouds.openstack.v2_0.features.ExtensionAsyncApi;
+import org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet;
 import org.jclouds.rest.ConfiguresRestClient;
 import org.jclouds.rest.config.RestClientModule;
+import org.jclouds.rest.functions.ImplicitOptionalConverter;
 
 import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
@@ -79,6 +81,7 @@ public class QuantumRestClientModule<S extends QuantumApi, A extends QuantumAsyn
    @Override
    protected void configure() {
       bind(DateAdapter.class).to(Iso8601DateAdapter.class);
+      bind(ImplicitOptionalConverter.class).to(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.class);
       super.configure();
    }
    
diff --git a/labs/openstack-swift/src/main/java/org/jclouds/openstack/swift/v1/config/SwiftRestClientModule.java b/labs/openstack-swift/src/main/java/org/jclouds/openstack/swift/v1/config/SwiftRestClientModule.java
index b6fe6b4c4d..a0489d09d5 100644
--- a/labs/openstack-swift/src/main/java/org/jclouds/openstack/swift/v1/config/SwiftRestClientModule.java
+++ b/labs/openstack-swift/src/main/java/org/jclouds/openstack/swift/v1/config/SwiftRestClientModule.java
@@ -44,8 +44,10 @@ import org.jclouds.openstack.swift.v1.handlers.SwiftErrorHandler;
 import org.jclouds.openstack.v2_0.domain.Extension;
 import org.jclouds.openstack.v2_0.features.ExtensionApi;
 import org.jclouds.openstack.v2_0.features.ExtensionAsyncApi;
+import org.jclouds.openstack.v2_0.functions.PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet;
 import org.jclouds.rest.ConfiguresRestClient;
 import org.jclouds.rest.config.RestClientModule;
+import org.jclouds.rest.functions.ImplicitOptionalConverter;
 
 import com.google.common.cache.CacheBuilder;
 import com.google.common.cache.CacheLoader;
@@ -82,6 +84,7 @@ public class SwiftRestClientModule<S extends SwiftApi, A extends SwiftAsyncApi>
    @Override
    protected void configure() {
       bind(DateAdapter.class).to(Iso8601DateAdapter.class);
+      bind(ImplicitOptionalConverter.class).to(PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSet.class);
       super.configure();
    }