diff --git a/test-service.groovy b/test-service.groovy
index f7cdd64..232b386 100644
--- a/test-service.groovy
+++ b/test-service.groovy
@@ -46,7 +46,7 @@
                 def output_file = image.replaceAll('/', '-') + '.output'
 
                 // run image
-                test.runConformanceTests(saltMaster, TEST_K8S_API_SERVER, image)
+                test.runConformanceTests(saltMaster, 'ctl01*', TEST_K8S_API_SERVER, image)
 
                 // collect output
                 sh "mkdir -p ${artifacts_dir}"
@@ -63,7 +63,7 @@
                 def output_file = image.replaceAll('/', '-') + '.output'
 
                 // run image
-                test.runConformanceTests(saltMaster, TEST_K8S_API_SERVER, image)
+                test.runConformanceTests(saltMaster, 'ctl01*', TEST_K8S_API_SERVER, image)
 
                 // collect output
                 sh "mkdir -p ${artifacts_dir}"