diff --git a/optional-requirements.txt b/optional-requirements.txt
index fa3d7025..2e480cdd 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -24,6 +24,7 @@ pygal
 pymdstat
 pysnmp
 pySMART.smartx
+python-dateutil
 pyzmq
 requests
 scandir; python_version < "3.5"
diff --git a/setup.py b/setup.py
index 653b63db..05beac93 100755
--- a/setup.py
+++ b/setup.py
@@ -54,7 +54,7 @@ def get_install_extras_require():
         'action': ['chevron'],
         'browser': ['zeroconf==0.19.1' if PY2 else 'zeroconf>=0.19.1'],
         'cloud': ['requests'],
-        'docker': ['docker>=2.0.0'],
+        'docker': ['docker>=2.0.0', 'python-dateutil'],
         'export': ['bernhard', 'cassandra-driver', 'couchdb', 'elasticsearch',
                    'graphitesender', 'influxdb>=1.0.0', 'kafka-python', 'pika',
                    'paho-mqtt', 'potsdb', 'prometheus_client', 'pyzmq',