diff --git a/include/wx/mac/carbon/colour.h b/include/wx/mac/carbon/colour.h
index 4053598903..9acf4d42b9 100644
--- a/include/wx/mac/carbon/colour.h
+++ b/include/wx/mac/carbon/colour.h
@@ -31,7 +31,7 @@ public:
 
     // accessors
     bool Ok() const { return IsOk(); }
-    bool IsOk() const {return m_isInit; }
+    bool IsOk() const;
 
     unsigned char Red() const { return m_red; }
     unsigned char Green() const { return m_green; }
diff --git a/src/mac/carbon/colour.cpp b/src/mac/carbon/colour.cpp
index 2572be337b..6a3562c3d4 100644
--- a/src/mac/carbon/colour.cpp
+++ b/src/mac/carbon/colour.cpp
@@ -63,3 +63,9 @@ void wxColour::FromRGBColor( WXCOLORREF* color )
     m_blue = col->blue >> 8;
     m_green = col->green >> 8;
 }
+
+bool wxColour::IsOk() const 
+{
+    return m_isInit; 
+}
+