diff --git a/libs/gtkmm2ext/gtkmm2ext/keyboard.h b/libs/gtkmm2ext/gtkmm2ext/keyboard.h
index fca5d9f817..03ba297be0 100644
--- a/libs/gtkmm2ext/gtkmm2ext/keyboard.h
+++ b/libs/gtkmm2ext/gtkmm2ext/keyboard.h
@@ -70,7 +70,6 @@ class LIBGTKMM2EXT_API Keyboard : public sigc::trackable, PBD::Stateful
 	static const char* secondary_modifier_name ();
 	static const char* tertiary_modifier_name ();
 	static const char* level4_modifier_name ();
-	static const char* copy_modifier_name ();
 	static const char* rangeselect_modifier_name ();
 
 	static void set_primary_modifier (uint32_t newval) {
diff --git a/libs/gtkmm2ext/keyboard.cc b/libs/gtkmm2ext/keyboard.cc
index fb6a034ea7..47a8db006c 100644
--- a/libs/gtkmm2ext/keyboard.cc
+++ b/libs/gtkmm2ext/keyboard.cc
@@ -70,7 +70,6 @@ const char* Keyboard::primary_modifier_name() { return _("Command"); }
 const char* Keyboard::secondary_modifier_name() { return _("Control"); }
 const char* Keyboard::tertiary_modifier_name() { return S_("Key|Shift"); }
 const char* Keyboard::level4_modifier_name() { return _("Option"); }
-const char* Keyboard::copy_modifier_name() { return _("Control"); }
 const char* Keyboard::rangeselect_modifier_name() { return S_("Key|Shift"); }
 
 guint Keyboard::snap_mod = Keyboard::Level4Modifier|Keyboard::TertiaryModifier; // XXX this is probably completely wrong
@@ -90,7 +89,6 @@ const char* Keyboard::primary_modifier_name() { return _("Control"); }
 const char* Keyboard::secondary_modifier_name() { return _("Alt"); }
 const char* Keyboard::tertiary_modifier_name() { return S_("Key|Shift"); }
 const char* Keyboard::level4_modifier_name() { return _("Windows"); }
-const char* Keyboard::copy_modifier_name() { return _("Control"); }
 const char* Keyboard::rangeselect_modifier_name() { return S_("Key|Shift"); }
 
 guint Keyboard::snap_mod = Keyboard::SecondaryModifier;