diff --git a/app/os_macos.go b/app/os_macos.go
index f9f6baa2..3302b312 100644
--- a/app/os_macos.go
+++ b/app/os_macos.go
@@ -523,6 +523,8 @@ func gio_onMouse(view, evt C.CFTypeRef, cdir C.int, cbtn C.NSInteger, x, y, dx,
 		btn = pointer.ButtonPrimary
 	case 1:
 		btn = pointer.ButtonSecondary
+	case 2:
+		btn = pointer.ButtonTertiary
 	}
 	var typ pointer.Type
 	switch cdir {
diff --git a/app/os_macos.m b/app/os_macos.m
index ca37371f..5f82f258 100644
--- a/app/os_macos.m
+++ b/app/os_macos.m
@@ -92,18 +92,18 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 - (void)mouseUp:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_UP, 0, 0);
 }
-- (void)middleMouseDown:(NSEvent *)event {
-	handleMouse(self, event, MOUSE_DOWN, 0, 0);
-}
-- (void)middleMouseUp:(NSEvent *)event {
-	handleMouse(self, event, MOUSE_UP, 0, 0);
-}
 - (void)rightMouseDown:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_DOWN, 0, 0);
 }
 - (void)rightMouseUp:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_UP, 0, 0);
 }
+- (void)otherMouseDown:(NSEvent *)event {
+	handleMouse(self, event, MOUSE_DOWN, 0, 0);
+}
+- (void)otherMouseUp:(NSEvent *)event {
+	handleMouse(self, event, MOUSE_UP, 0, 0);
+}
 - (void)mouseMoved:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_MOVE, 0, 0);
 }