diff --git a/libs/ardour/ardour/gain_control.h b/libs/ardour/ardour/gain_control.h
index f8263adcd1..491705bafe 100644
--- a/libs/ardour/ardour/gain_control.h
+++ b/libs/ardour/ardour/gain_control.h
@@ -44,6 +44,7 @@ class LIBARDOUR_API GainControl : public SlavableAutomationControl {
 protected:
 	void post_add_master (std::shared_ptr<AutomationControl>);
 	bool get_masters_curve_locked (samplepos_t, samplepos_t, float*, samplecnt_t) const;
+	void actually_set_value (double value, PBD::Controllable::GroupControlDisposition);
 };
 
 } /* namespace */
diff --git a/libs/ardour/gain_control.cc b/libs/ardour/gain_control.cc
index 5c28eb4aa6..dc41145faa 100644
--- a/libs/ardour/gain_control.cc
+++ b/libs/ardour/gain_control.cc
@@ -107,6 +107,17 @@ GainControl::inc_gain (gain_t factor)
 	}
 }
 
+void
+GainControl::actually_set_value (double value, PBD::Controllable::GroupControlDisposition gcd)
+{
+	const double max_factor = _desc.from_interface (1.0);
+	const double min_factor = _desc.from_interface (0.0);
+
+	value = std::max (min_factor, std::min (value, max_factor));
+
+	SlavableAutomationControl::actually_set_value (value, gcd);
+}
+
 void
 GainControl::post_add_master (std::shared_ptr<AutomationControl> m)
 {