diff --git a/oslo_reports/guru_meditation_report.py b/oslo_reports/guru_meditation_report.py
index 0277f2e..22eba42 100644
--- a/oslo_reports/guru_meditation_report.py
+++ b/oslo_reports/guru_meditation_report.py
@@ -75,6 +75,11 @@ from oslo_reports.generators import threading as tgen
 from oslo_reports.generators import version as pgen
 from oslo_reports import report
 
+try:
+    import greenlet
+except ImportError:
+    greenlet = None
+
 
 LOG = logging.getLogger(__name__)
 
@@ -240,8 +245,9 @@ class GuruMeditation(object):
         self.add_section('Threads',
                          tgen.ThreadReportGenerator(self.traceback))
 
-        self.add_section('Green Threads',
-                         tgen.GreenThreadReportGenerator())
+        if greenlet:
+            self.add_section('Green Threads',
+                             tgen.GreenThreadReportGenerator())
 
         self.add_section('Processes',
                          prgen.ProcessReportGenerator())
diff --git a/requirements.txt b/requirements.txt
index 3109050..a94ff0e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,5 +4,4 @@ oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 psutil>=3.2.2 # BSD
 oslo.i18n>=3.15.3 # Apache-2.0
 oslo.utils>=3.33.0 # Apache-2.0
-greenlet>=0.4.15 # MIT
 oslo.config>=5.1.0 # Apache-2.0
diff --git a/setup.cfg b/setup.cfg
index f50ca90..f59fcf7 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -22,6 +22,10 @@ classifier =
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: Implementation :: CPython
 
+[extras]
+greenlet =
+  greenlet>=0.4.15 # MIT
+
 [files]
 packages =
     oslo_reports
diff --git a/test-requirements.txt b/test-requirements.txt
index dc73502..cb618c0 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@ oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0
 
 # for testing optional parts
-eventlet!=0.18.3,!=0.20.1,>=0.18.2 # MIT
+greenlet>=0.4.15 # MIT
 
 coverage!=4.4,>=4.0 # Apache-2.0