diff --git a/src/mac/carbon/radiobut.cpp b/src/mac/carbon/radiobut.cpp
index 94aad1efaf..c8530a88cd 100644
--- a/src/mac/carbon/radiobut.cpp
+++ b/src/mac/carbon/radiobut.cpp
@@ -37,6 +37,8 @@ bool wxRadioButton::Create(wxWindow *parent, wxWindowID id,
 	
 	MacPostControlCreate() ;
 
+  m_cycle = NULL ;
+  
   if (HasFlag(wxRB_GROUP))
   {
 	  AddInCycle( NULL ) ;
diff --git a/src/mac/radiobut.cpp b/src/mac/radiobut.cpp
index 94aad1efaf..c8530a88cd 100644
--- a/src/mac/radiobut.cpp
+++ b/src/mac/radiobut.cpp
@@ -37,6 +37,8 @@ bool wxRadioButton::Create(wxWindow *parent, wxWindowID id,
 	
 	MacPostControlCreate() ;
 
+  m_cycle = NULL ;
+  
   if (HasFlag(wxRB_GROUP))
   {
 	  AddInCycle( NULL ) ;