diff --git a/python-HyperKitty.spec b/python-HyperKitty.spec
index e2e3d48..11990a7 100644
--- a/python-HyperKitty.spec
+++ b/python-HyperKitty.spec
@@ -58,6 +58,7 @@ Patch0:         hyperkitty-settings.patch
 BuildRequires:  %{python_module django-debug-toolbar >= 2.2}
 BuildRequires:  %{python_module isort}
 BuildRequires:  %{python_module libsass}
+BuildRequires:  %{python_module mistune >= 2.0}
 BuildRequires:  %{python_module setuptools}
 BuildRequires:  acl
 BuildRequires:  fdupes