diff --git a/setup.cfg b/setup.cfg
index 6405835..65dea13 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -13,7 +13,7 @@ project_urls =
     Source Code = https://github.com/alexforencich/cocotbext-eth
 download_url = https://github.com/alexforencich/cocotbext-eth/tarball/master
 long_description = file: README.md
-long-description-content-type = text/markdown
+long_description_content_type = text/markdown
 platforms = any
 classifiers =
     Development Status :: 3 - Alpha