diff --git a/setup.py b/setup.py
index 143746ab..8cb1162b 100755
--- a/setup.py
+++ b/setup.py
@@ -124,8 +124,7 @@ def run(self):
     ],
     install_requires=[
         'pytest>=4.6',
-        'coverage>=5.2.1',
-        'toml'
+        'coverage[toml]>=5.2.1'
     ],
     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*',
     extras_require={