diff --git a/src/cocoa/button.mm b/src/cocoa/button.mm
index 7b93013217..5bf61552c3 100644
--- a/src/cocoa/button.mm
+++ b/src/cocoa/button.mm
@@ -21,6 +21,10 @@
 #import <AppKit/NSButton.h>
 #include "wx/cocoa/string.h"
 
+wxButtonBase::wxButtonBase()
+{
+}
+
 IMPLEMENT_DYNAMIC_CLASS(wxButton, wxControl)
 BEGIN_EVENT_TABLE(wxButton, wxButtonBase)
 END_EVENT_TABLE()
diff --git a/src/cocoa/checkbox.mm b/src/cocoa/checkbox.mm
index 04204304f1..d5a0e99f1d 100644
--- a/src/cocoa/checkbox.mm
+++ b/src/cocoa/checkbox.mm
@@ -22,6 +22,10 @@
 #import <AppKit/NSButton.h>
 #import <Foundation/NSString.h>
 
+wxCheckBoxBase::wxCheckBoxBase()
+{
+}
+
 IMPLEMENT_DYNAMIC_CLASS(wxCheckBox, wxControl)
 BEGIN_EVENT_TABLE(wxCheckBox, wxCheckBoxBase)
 END_EVENT_TABLE()