diff --git a/python-aiohttp.spec b/python-aiohttp.spec
index 92d6a91..7cea1e6 100644
--- a/python-aiohttp.spec
+++ b/python-aiohttp.spec
@@ -49,6 +49,7 @@ BuildRequires:  %{python_module attrs >= 17.3.0}
 BuildRequires:  %{python_module brotlipy}
 BuildRequires:  %{python_module chardet >= 2.0}
 BuildRequires:  %{python_module gunicorn}
+BuildRequires:  %{python_module idna_ssl >= 1.0}
 BuildRequires:  %{python_module multidict >= 4.0}
 BuildRequires:  %{python_module pluggy}
 BuildRequires:  %{python_module pytest-cov}