diff --git a/nghttp2.spec b/nghttp2.spec
index d298825..1205318 100644
--- a/nghttp2.spec
+++ b/nghttp2.spec
@@ -36,6 +36,7 @@ BuildRequires:  automake
 BuildRequires:  gcc-c++
 BuildRequires:  libtool
 BuildRequires:  pkgconfig
+BuildRequires:  python3-devel
 BuildRequires:  python3-Cython
 BuildRequires:  python3-setuptools
 BuildRequires:  pkgconfig(cunit)