diff --git a/Envelope_3/include/CGAL/Envelope_3/envelope_number_of_surfaces.h b/Envelope_3/include/CGAL/Envelope_3/envelope_number_of_surfaces.h
index 88c56d5e2c7..e8ae5e8464f 100644
--- a/Envelope_3/include/CGAL/Envelope_3/envelope_number_of_surfaces.h
+++ b/Envelope_3/include/CGAL/Envelope_3/envelope_number_of_surfaces.h
@@ -20,8 +20,6 @@
 #ifndef CGAL_ENVELOPE_NUMBER_OF_SURFACES_H
 #define CGAL_ENVELOPE_NUMBER_OF_SURFACES_H
 
-#include <CGAL/Timer.h>
-
 #include <iostream>
 #include <cassert>
 #include <list>