diff --git a/Fltk/extraDialogs.cpp b/Fltk/extraDialogs.cpp
index d13ffaf279ff6a8e37ef7568be1b2182a2a9d68b..acd6144b650a4012093f511451ee79ff2d6e083f 100644
--- a/Fltk/extraDialogs.cpp
+++ b/Fltk/extraDialogs.cpp
@@ -8,6 +8,7 @@
 //
 
 #include <stdio.h>
+#include <string.h>
 #include <FL/Fl_Value_Slider.H>
 #include <FL/Fl_Menu_Window.H>
 #include <FL/Fl_Select_Browser.H>