diff --git a/src/osx/button_osx.cpp b/src/osx/button_osx.cpp
index 70be0e99ce..3dc35b6975 100644
--- a/src/osx/button_osx.cpp
+++ b/src/osx/button_osx.cpp
@@ -123,6 +123,6 @@ bool wxDisclosureTriangle::OSXHandleClicked( double WXUNUSED(timestampsec) )
 
 wxSize wxDisclosureTriangle::DoGetBestSize() const
 {
-    return wxSize(16,16);
+    return wxWindow::DoGetBestSize();
 }