diff --git a/theme/boost/scss/moodle/bootstrap-rtl.scss b/theme/boost/scss/moodle/bootstrap-rtl.scss
index a2d412721fd55..53f7c3e1c0ea3 100644
--- a/theme/boost/scss/moodle/bootstrap-rtl.scss
+++ b/theme/boost/scss/moodle/bootstrap-rtl.scss
@@ -13,6 +13,10 @@
     }
 }
 
+.dir-rtl .custom-select {
+    background-position: 0.75rem center;
+}
+
 /*rtl:raw:
 .dropdown-menu {
     right: auto;
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index 0d79e5e320c53..7814232456f1c 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -9701,6 +9701,9 @@ input[disabled] {
   content: "/";
   /* stylelint-disable-line declaration-block-no-duplicate-properties */ }
 
+.dir-rtl .custom-select {
+  background-position: 0.75rem center; }
+
 /*rtl:raw:
 .dropdown-menu {
     right: auto;
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 0578c9a1ea2d5..06fc07fc0968c 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -9949,6 +9949,9 @@ input[disabled] {
   content: "/";
   /* stylelint-disable-line declaration-block-no-duplicate-properties */ }
 
+.dir-rtl .custom-select {
+  background-position: 0.75rem center; }
+
 /*rtl:raw:
 .dropdown-menu {
     right: auto;