diff --git a/include/wx/mac/setup.h b/include/wx/mac/setup.h
index 5c2022a8b3..372737214d 100644
--- a/include/wx/mac/setup.h
+++ b/include/wx/mac/setup.h
@@ -245,7 +245,7 @@
 
 #define wxUSE_SERIAL        0
                                   // Use serialization (requires utils/serialize)
-#define wxUSE_DYNLIB_CLASS  0
+#define wxUSE_DYNLIB_CLASS  1
                                   // Compile in wxLibrary class for run-time
                                   // DLL loading and function calling
 #define wxUSE_TOOLTIPS      1