diff --git a/Timeline/LASH_Engine.C b/Timeline/LASH_Engine.C
index 2d91cf3..b3b4108 100644
--- a/Timeline/LASH_Engine.C
+++ b/Timeline/LASH_Engine.C
@@ -28,6 +28,7 @@
 #include "TLE.H" // all this just for quit()
 
 #include <FL/Fl.H>
+#include <FL/filename.H>
 
 extern TLE *tle;