diff --git a/include/wx/mac/corefoundation/cfref.h b/include/wx/mac/corefoundation/cfref.h
index fb84f0fc5c..694a19d7c9 100644
--- a/include/wx/mac/corefoundation/cfref.h
+++ b/include/wx/mac/corefoundation/cfref.h
@@ -23,8 +23,8 @@
  * Note that Darwin CF uses extern for CF_EXPORT.  If we need this on Win32
  * or non-Darwin Mac OS we'll need to define the appropriate __declspec.
  */
-extern "C" {
 typedef const void *CFTypeRef;
+extern "C" {
 extern /* CF_EXPORT */
 CFTypeRef CFRetain(CFTypeRef cf);
 extern /* CF_EXPORT */