diff --git a/mgllab/mgllab.cpp b/mgllab/mgllab.cpp
index ef2d556..36fbfc4 100644
--- a/mgllab/mgllab.cpp
+++ b/mgllab/mgllab.cpp
@@ -344,7 +344,7 @@ Fl_Menu_Item menuitems[] = {
 void mem_upd_cb(Fl_Widget *, void *v)
 {	((ScriptWindow*)v)->mem_init();	}
 //-----------------------------------------------------------------------------
-extern Fl_RGB_Image img_udav;
+extern MGL_EXPORT Fl_RGB_Image img_udav;
 ScriptWindow *new_view()
 {
 	Fl_Group *gg;