diff --git a/src/mac/carbon/radiobut.cpp b/src/mac/carbon/radiobut.cpp
index c8530a88cd..84f2a739cb 100644
--- a/src/mac/carbon/radiobut.cpp
+++ b/src/mac/carbon/radiobut.cpp
@@ -37,7 +37,7 @@ bool wxRadioButton::Create(wxWindow *parent, wxWindowID id,
 	
 	MacPostControlCreate() ;
 
-  m_cycle = NULL ;
+  m_cycle = this ;
   
   if (HasFlag(wxRB_GROUP))
   {
diff --git a/src/mac/radiobut.cpp b/src/mac/radiobut.cpp
index c8530a88cd..84f2a739cb 100644
--- a/src/mac/radiobut.cpp
+++ b/src/mac/radiobut.cpp
@@ -37,7 +37,7 @@ bool wxRadioButton::Create(wxWindow *parent, wxWindowID id,
 	
 	MacPostControlCreate() ;
 
-  m_cycle = NULL ;
+  m_cycle = this ;
   
   if (HasFlag(wxRB_GROUP))
   {