diff --git a/include/wx/gtk/icon.h b/include/wx/gtk/icon.h
index 1611ffe6dd..7596879cd9 100644
--- a/include/wx/gtk/icon.h
+++ b/include/wx/gtk/icon.h
@@ -40,7 +40,8 @@ public:
   wxIcon(const wxIcon& icon);
   wxIcon(const wxIcon* icon);
   wxIcon( char **bits, int width=-1, int height=-1 );
-  
+
+  wxIcon& operator = (const wxIcon& icon);
   inline bool operator == (const wxIcon& icon) { return m_refData == icon.m_refData; }
   inline bool operator != (const wxIcon& icon) { return m_refData != icon.m_refData; }
 };
diff --git a/include/wx/gtk1/icon.h b/include/wx/gtk1/icon.h
index 1611ffe6dd..7596879cd9 100644
--- a/include/wx/gtk1/icon.h
+++ b/include/wx/gtk1/icon.h
@@ -40,7 +40,8 @@ public:
   wxIcon(const wxIcon& icon);
   wxIcon(const wxIcon* icon);
   wxIcon( char **bits, int width=-1, int height=-1 );
-  
+
+  wxIcon& operator = (const wxIcon& icon);
   inline bool operator == (const wxIcon& icon) { return m_refData == icon.m_refData; }
   inline bool operator != (const wxIcon& icon) { return m_refData != icon.m_refData; }
 };