diff --git a/jenkins_jobs/builder.py b/jenkins_jobs/builder.py
index 5d018c38b..94bd803a7 100644
--- a/jenkins_jobs/builder.py
+++ b/jenkins_jobs/builder.py
@@ -34,6 +34,9 @@ from jenkins_jobs.constants import MAGIC_MANAGE_STRING
 from jenkins_jobs.parallel import concurrent
 from jenkins_jobs import utils
 
+__all__ = [
+    "Jenkins"
+]
 
 logger = logging.getLogger(__name__)
 
diff --git a/jenkins_jobs/parser.py b/jenkins_jobs/parser.py
index 880baa249..f39d08eff 100644
--- a/jenkins_jobs/parser.py
+++ b/jenkins_jobs/parser.py
@@ -28,6 +28,10 @@ from jenkins_jobs.formatter import deep_format
 import jenkins_jobs.local_yaml as local_yaml
 from jenkins_jobs import utils
 
+__all__ = [
+    "YamlParser"
+]
+
 logger = logging.getLogger(__name__)
 
 
diff --git a/jenkins_jobs/registry.py b/jenkins_jobs/registry.py
index a37d02df1..a81f1a342 100644
--- a/jenkins_jobs/registry.py
+++ b/jenkins_jobs/registry.py
@@ -24,6 +24,10 @@ import types
 from jenkins_jobs.errors import JenkinsJobsException
 from jenkins_jobs.formatter import deep_format
 
+__all__ = [
+    "ModuleRegistry"
+]
+
 logger = logging.getLogger(__name__)
 
 
diff --git a/jenkins_jobs/xml_config.py b/jenkins_jobs/xml_config.py
index 3aa33564d..44af5ac85 100644
--- a/jenkins_jobs/xml_config.py
+++ b/jenkins_jobs/xml_config.py
@@ -20,6 +20,11 @@ import pkg_resources
 from xml.dom import minidom
 import xml.etree.ElementTree as XML
 
+__all__ = [
+    "XmlJobGenerator",
+    "XmlJob"
+]
+
 
 def remove_ignorable_whitespace(node):
     """Remove insignificant whitespace from XML nodes