diff --git a/kf5-kirigami2.spec b/kf5-kirigami2.spec
index aa375f6..e865d45 100644
--- a/kf5-kirigami2.spec
+++ b/kf5-kirigami2.spec
@@ -1,4 +1,3 @@
-%undefine __cmake_in_source_build
 %global framework kirigami2
 
 # uncomment to enable bootstrap mode
@@ -41,6 +40,9 @@ BuildRequires: qt5-qtdeclarative-devel
 BuildRequires: qt5-qtquickcontrols2-devel
 BuildRequires: qt5-qtsvg-devel
 
+BuildRequires: qt5-qtbase-private-devel
+%{?_qt5:Requires: %{_qt5}%{?_isa} = %{_qt5_version}}
+
 %if 0%{?tests}
 %if 0%{?fedora}
 BuildRequires: appstream
@@ -123,6 +125,7 @@ make test ARGS="--output-on-failure --timeout 30" -C %{_target_platform} ||:
 %changelog
 * Thu Aug 12 2021 Rex Dieter <rdieter@fedoraproject.org> - 5.85.0-1
 - 5.85.0
+- BR: qt5-qtbase-private-devel, grew dep on private API
 
 * Thu Jul 22 2021 Fedora Release Engineering <releng@fedoraproject.org> - 5.83.0-2
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_35_Mass_Rebuild