diff --git a/apis/openstack-nova/src/test/java/org/jclouds/openstack/nova/v2_0/functions/PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest.java b/apis/openstack-nova/src/test/java/org/jclouds/openstack/nova/v2_0/functions/PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest.java
index 6cf3a25c6d..37228b8bf8 100644
--- a/apis/openstack-nova/src/test/java/org/jclouds/openstack/nova/v2_0/functions/PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest.java
+++ b/apis/openstack-nova/src/test/java/org/jclouds/openstack/nova/v2_0/functions/PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest.java
@@ -32,7 +32,7 @@ import com.google.inject.Provides;
 /**
  * @author Adrian Cole
  */
-@Test(groups = "unit", testName = "PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest")
+@Test(groups = "unit", singleThreaded = true, testName = "PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest")
 public class PresentWhenExtensionAnnotationNamespaceEqualsAnyNamespaceInExtensionsSetTest {
 
    Extension keypairs = Extension.builder().alias("os-keypairs").name("Keypairs").namespace(