diff --git a/openstack_dashboard/themes/material/static/horizon/_styles.scss b/openstack_dashboard/themes/material/static/horizon/_styles.scss
index 047af99431..8b07757271 100644
--- a/openstack_dashboard/themes/material/static/horizon/_styles.scss
+++ b/openstack_dashboard/themes/material/static/horizon/_styles.scss
@@ -1,3 +1,12 @@
+// NOTE(e0ne): it's temporary workaround to until specified function will
+// be supported by pyScss. We need to define this function before any MDI
+// usage.
+@if not function-exists("selector-append") {
+  @function selector-append($selector, $to-append) {
+    @return append-selector($selector, $to-append);
+  }
+}
+
 @import "animations";
 @import "icons";
 @import "components/checkboxes";
diff --git a/releasenotes/notes/pyscss-and-setuptools-7634dcee9d62bde9.yaml b/releasenotes/notes/pyscss-and-setuptools-7634dcee9d62bde9.yaml
index cdf8a2a0c6..ed0b351180 100644
--- a/releasenotes/notes/pyscss-and-setuptools-7634dcee9d62bde9.yaml
+++ b/releasenotes/notes/pyscss-and-setuptools-7634dcee9d62bde9.yaml
@@ -1,13 +1,9 @@
 ---
-issues:
-  - |
-    The material design theme is now broken with pyScss 1.3.7
-    (also see the upgrade notice section).
-    If you really depends on the material design theme, keep using
-    pyScss 1.3.4 with setuptools<45 (while the horizon dependencies list
-    says pyScss>=1.3.7 is required).
-    The issue is tracked via [:bug:`1771559`].
 upgrade:
   - |
     pyScss 1.3.7 is now required due to the incompatibility that
     pyScss 1.3.4 used before in horizon does not work with setuptools 46.
+  - |
+    Along with the upgrade of pyScss to 1.3.7, a workaround for the
+    material design theme is added to make it work properly.
+    See [:bug:`1771559`] for detail.