diff --git a/include/wx/dnd.h b/include/wx/dnd.h
index ccc82d422a..498bbc7afe 100644
--- a/include/wx/dnd.h
+++ b/include/wx/dnd.h
@@ -45,10 +45,9 @@ enum wxDragResult
     wxDragCancel    // the operation was cancelled by user (not an error)
 };
 
-inline WXDLLEXPORT bool wxIsDragResultOk(wxDragResult res)
-{
-    return res == wxDragCopy || res == wxDragMove || res == wxDragLink;
-}
+// return true if res indicates that something was done during a dnd operation,
+// i.e. is neither error nor none nor cancel
+WXDLLEXPORT bool wxIsDragResultOk(wxDragResult res);
 
 // ----------------------------------------------------------------------------
 // wxDropSource is the object you need to create (and call DoDragDrop on it)
diff --git a/src/common/dndcmn.cpp b/src/common/dndcmn.cpp
index b13ba86d34..7cc7e7413a 100644
--- a/src/common/dndcmn.cpp
+++ b/src/common/dndcmn.cpp
@@ -20,4 +20,8 @@
 
 #include "wx/dnd.h"
 
-// Not much to do here, really, but GNU need this file.
+bool wxIsDragResultOk(wxDragResult res)
+{
+    return res == wxDragCopy || res == wxDragMove || res == wxDragLink;
+}
+