diff --git a/scripts/rpm-data/klayout.spec b/scripts/rpm-data/klayout.spec
index 7f29304db..e326ed4ff 100644
--- a/scripts/rpm-data/klayout.spec
+++ b/scripts/rpm-data/klayout.spec
@@ -40,6 +40,9 @@ Requires: qt5-qtmultimedia >= 5.11.1
 Requires: qt5-qtxmlpatterns >= 5.11.1
 Requires: qt5-qtsvg >= 5.11.1
 Requires: qt5-qttools >= 5.11.1
+# NOTE: this package is required for libQt5Designer and pulls in a lot of devel stuff.
+# Maybe it's worth considering to drop designer support and replace by QUiLoader.
+Requires: qt5-qttools-devel >= 5.11.1
 
 %define buildopt -j2
 %define pylib %{python_sitearch}