diff --git a/src/fl_scroll_area.cxx b/src/fl_scroll_area.cxx
index e9fe9c1df..7574fa669 100644
--- a/src/fl_scroll_area.cxx
+++ b/src/fl_scroll_area.cxx
@@ -1,7 +1,7 @@
 //
 // Scrolling routines for the Fast Light Tool Kit (FLTK).
 //
-// Copyright 1998-2016 by Bill Spitzak and others.
+// Copyright 1998-2021 by Bill Spitzak and others.
 //
 // This library is free software. Distribution and use rights are outlined in
 // the file "COPYING" which should have been included with this file.  If this
@@ -19,6 +19,7 @@
 // into the drawing area.
 
 #include "Fl_Window_Driver.H"
+#include <FL/fl_draw.H>
 
 // scroll a rectangle and redraw the newly exposed portions:
 /**