diff --git a/python-pep517.spec b/python-pep517.spec
index 0485dbc..0615b9b 100644
--- a/python-pep517.spec
+++ b/python-pep517.spec
@@ -13,6 +13,7 @@ URL:            https://github.com/takluyver/pep517
 Source0:        %{pypi_source}
 BuildArch:      noarch
 
+# Don't use %%pyproject_buildrequires to avoid a build dependency loop.
 BuildRequires:  python3-devel
 BuildRequires:  pyproject-rpm-macros
 BuildRequires:  python3dist(flit)
@@ -22,7 +23,6 @@ BuildRequires:  python3dist(pytest)
 BuildRequires:  python3dist(pytoml)
 BuildRequires:  python3dist(mock)
 BuildRequires:  python3dist(testpath)
-BuildRequires:  python3dist(pytoml)
 %endif