diff --git a/include/wx/renderer.h b/include/wx/renderer.h
index 97152e32e3..a6076b5b96 100644
--- a/include/wx/renderer.h
+++ b/include/wx/renderer.h
@@ -52,6 +52,7 @@ class WXDLLIMPEXP_FWD_CORE wxWindow;
 // control state flags used in wxRenderer and wxColourScheme
 enum
 {
+    wxCONTROL_NONE       = 0x00000000,  // absence of any other flags
     wxCONTROL_DISABLED   = 0x00000001,  // control is disabled
     wxCONTROL_FOCUSED    = 0x00000002,  // currently has keyboard focus
     wxCONTROL_PRESSED    = 0x00000004,  // (button) is pressed
diff --git a/interface/wx/renderer.h b/interface/wx/renderer.h
index ef1d487967..7ff81f43b6 100644
--- a/interface/wx/renderer.h
+++ b/interface/wx/renderer.h
@@ -12,6 +12,13 @@
 */
 enum
 {
+    /**
+        Default state, no special flags.
+
+        @since 3.1.0
+     */
+    wxCONTROL_NONE       = 0x00000000,
+
     /** Control is disabled. */
     wxCONTROL_DISABLED   = 0x00000001,
 
diff --git a/src/msw/radiobut.cpp b/src/msw/radiobut.cpp
index 3737df1cc9..74c9062bc6 100644
--- a/src/msw/radiobut.cpp
+++ b/src/msw/radiobut.cpp
@@ -322,7 +322,7 @@ void wxRadioButton::MSWOnButtonResetOwnerDrawn()
 
 int wxRadioButton::MSWGetButtonCheckedFlag() const
 {
-    return m_isChecked ? wxCONTROL_CHECKED : 0;
+    return m_isChecked ? wxCONTROL_CHECKED : wxCONTROL_NONE;
 }
 
 void wxRadioButton::MSWDrawButtonBitmap(wxDC& dc, const wxRect& rect, int flags)