diff --git a/src/pw3270/private.h b/src/pw3270/private.h
index dcfd896..b1807a8 100644
--- a/src/pw3270/private.h
+++ b/src/pw3270/private.h
@@ -43,10 +43,10 @@
 
  #if ! GLIB_CHECK_VERSION(2,44,0)
 
-	G_GNUC_INTERNAL void pw3270_autoptr_cleanup_generic_gfree(void *p);
-
 	#define g_autofree __attribute__((cleanup(pw3270_autoptr_cleanup_generic_gfree)))
 
+	LIB3270_EXPORT void pw3270_autoptr_cleanup_generic_gfree(void *p);
+
  #endif // ! GLIB(2,44,0)
 
 
diff --git a/src/pw3270/tools.c b/src/pw3270/tools.c
index 4930684..00fcc81 100644
--- a/src/pw3270/tools.c
+++ b/src/pw3270/tools.c
@@ -339,7 +339,7 @@ LIB3270_EXPORT void pw3270_set_action_state(GtkAction *action, gboolean on)
  #if ! GLIB_CHECK_VERSION(2,44,0)
 
 	// Reference: https://github.com/ImageMagick/glib/blob/master/glib/glib-autocleanups.h
-	void pw3270_autoptr_cleanup_generic_gfree(void *p)
+	LIB3270_EXPORT void pw3270_autoptr_cleanup_generic_gfree(void *p)
 	{
 		void **pp = (void**)p;
 		g_free (*pp);
--
libgit2 0.21.2