diff --git a/src/generic/dirctrlg.cpp b/src/generic/dirctrlg.cpp
index 4aaa290e8b..68b26d6b6d 100644
--- a/src/generic/dirctrlg.cpp
+++ b/src/generic/dirctrlg.cpp
@@ -83,7 +83,6 @@
         #include <stdlib.h>
         #include <ctype.h>
     #endif
-    extern bool wxIsDriveAvailable(const wxString& dirName);
 #endif // __OS2__
 
 #if defined(__WXMAC__)
@@ -99,6 +98,8 @@
 #undef GetFirstChild
 #endif
 
+bool wxIsDriveAvailable(const wxString& dirName);
+
 // ----------------------------------------------------------------------------
 // wxGetAvailableDrives, for WINDOWS, DOS, OS2, MAC, UNIX (returns "/")
 // ----------------------------------------------------------------------------