diff --git a/src/gui/window.cpp b/src/gui/window.cpp
index 95ce64c..b4d664d 100644
--- a/src/gui/window.cpp
+++ b/src/gui/window.cpp
@@ -192,6 +192,9 @@ Gtk::Widget& EffectorWindow::buildChainTab() {
     params->append(paramHeading_);
     paramGrid_.set_column_spacing(8);
     paramGrid_.set_row_spacing(6);
+    // A gutter for the overlay scrollbar, which otherwise sits over the spin
+    // buttons' "+" and takes the clicks meant for it.
+    paramGrid_.set_margin_end(14);
     auto* paramScroller = Gtk::make_managed<Gtk::ScrolledWindow>();
     paramScroller->set_policy(Gtk::PolicyType::NEVER, Gtk::PolicyType::AUTOMATIC);
     paramScroller->set_child(paramGrid_);