diff --git a/.ci-macosx.sh b/.ci-macosx.sh
index f28fbc31b..657da4578 100644
--- a/.ci-macosx.sh
+++ b/.ci-macosx.sh
@@ -20,6 +20,8 @@ rm -f /usr/local/bin/idle3.11
 rm -f /usr/local/bin/pydoc3.11
 rm -f /usr/local/bin/python3.11
 rm -f /usr/local/bin/python3.11-config
+rm -f /usr/local/lib/libtcl8.6.dylib
+rm -f /usr/local/lib/libtk8.6.dylib
 brew upgrade
 
 brew install pkg-config
diff --git a/docs/howto-classify-students-answers.md b/docs/howto-classify-students-answers.md
index 68fe941c8..d3da56c37 100644
--- a/docs/howto-classify-students-answers.md
+++ b/docs/howto-classify-students-answers.md
@@ -21,7 +21,7 @@ Follow these steps:
 
 1. Go to the teaching tab in the LearnOCaml Web UI (needs a teacher token).
 
-2. Middle-click on the exercise `x` in the list of exercises.
+2. Hold Ctrl (on macOS: Hold ⌘) and left click on the exercise `x` in the list of exercises.
 
 3. Enter `foo` in the dialog box.
 
diff --git a/src/app/learnocaml_teacher_tab.ml b/src/app/learnocaml_teacher_tab.ml
index d8eb3e344..f0bf5fbd2 100644
--- a/src/app/learnocaml_teacher_tab.ml
+++ b/src/app/learnocaml_teacher_tab.ml
@@ -236,7 +236,13 @@ let rec teacher_tab token _select _params () =
               H.a_ondblclick (fun _ -> open_exercise_ ());
               H.a_onmouseup (fun ev ->
                   Js.Optdef.case ev##.which (fun () -> true) @@ fun btn ->
-                  if btn = Dom_html.Middle_button then open_partition_ () else true);
+                  if (Js.to_bool ev##.ctrlKey ||
+                      Js.to_bool ev##.metaKey (* ⌘ on macOS *))
+                     && btn = Dom_html.Left_button
+                  then
+                    open_partition_ ()
+                  else
+                    true);
             ] [
               auto_checkbox_td ();
               H.td ~a:[indent_style group_level]