diff --git a/theme/boost/scss/moodle/dropdown.scss b/theme/boost/scss/moodle/dropdown.scss
index f048302f391..b7d39aa5135 100644
--- a/theme/boost/scss/moodle/dropdown.scss
+++ b/theme/boost/scss/moodle/dropdown.scss
@@ -52,3 +52,10 @@
         }
     }
 }
+
+// Fixes for dropdown menu in RTL for moodle 4.x.
+.dir-rtl .dropdown-menu {
+    transform: none !important; /* stylelint-disable-line declaration-no-important */
+    top: 100% !important; /* stylelint-disable-line declaration-no-important */
+    right: inherit !important; /* stylelint-disable-line declaration-no-important */
+}
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index f3bf795565d..0ecd3869504 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -39274,6 +39274,12 @@ div.editor_atto_toolbar button .icon {
   color: #fff !important; /* stylelint-disable-line declaration-no-important */
 }
 
+.dir-rtl .dropdown-menu {
+  transform: none !important; /* stylelint-disable-line declaration-no-important */
+  top: 100% !important; /* stylelint-disable-line declaration-no-important */
+  right: inherit !important; /* stylelint-disable-line declaration-no-important */
+}
+
 /**
  Deprecations
  */
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index d8b99b912ec..fc8d2f0f6e5 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -39208,6 +39208,12 @@ div.editor_atto_toolbar button .icon {
   color: #fff !important; /* stylelint-disable-line declaration-no-important */
 }
 
+.dir-rtl .dropdown-menu {
+  transform: none !important; /* stylelint-disable-line declaration-no-important */
+  top: 100% !important; /* stylelint-disable-line declaration-no-important */
+  right: inherit !important; /* stylelint-disable-line declaration-no-important */
+}
+
 /**
  Deprecations
  */