diff --git a/CHANGES.txt b/CHANGES.txt
index e66ffe913..c78fdc395 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -6,6 +6,7 @@ Version 4.5.0
 
 Released : 10 October 2019
 
+* Add missing `long_description_content_type` field in setup. (#108)
 * Remove use of `2to3`. (#90)
 * Use etstool for CI tasks. Setup travis macos and appveyor CI. (#92)
 * Temporarily change cwd when running tests. (#104)
diff --git a/setup.py b/setup.py
index 23f17fc0d..d9e320ad9 100644
--- a/setup.py
+++ b/setup.py
@@ -123,6 +123,7 @@ def write_version_py(filename='apptools/_version.py'):
               """.splitlines() if len(c.strip()) > 0],
           description='application tools',
           long_description=open('README.rst').read(),
+          long_description_content_type="text/x-rst",
           include_package_data=True,
           package_data={'apptools': ['help/help_plugin/*.ini',
                                      'help/help_plugin/action/images/*.png',