diff --git a/curl.spec b/curl.spec
index 2c57c8f..20681c8 100644
--- a/curl.spec
+++ b/curl.spec
@@ -44,6 +44,9 @@ BuildRequires: python
 BuildRequires: stunnel
 BuildRequires: zlib-devel
 
+# nghttpx (an HTTP/2 proxy) is used by the upstream test-suite
+BuildRequires: nghttp2
+
 # perl modules used in the test suite
 BuildRequires: perl(Cwd)
 BuildRequires: perl(Digest::MD5)