diff --git a/ChangeLog b/ChangeLog
index 0d556cb2e..c309f79c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2004-12-01  Alexandre Duret-Lutz  <adl@src.lip6.fr>
+
+	* src/misc/timer.cc: Include cassert.
+
 2004-11-29  Alexandre Duret-Lutz  <adl@src.lip6.fr>
 
 	* src/misc/timer.hh, src/misc/timer.cc: New files.
diff --git a/src/misc/timer.cc b/src/misc/timer.cc
index a3b4566c7..ae75fd7ea 100644
--- a/src/misc/timer.cc
+++ b/src/misc/timer.cc
@@ -22,6 +22,7 @@
 #include "timer.hh"
 #include <iostream>
 #include <iomanip>
+#include <cassert>
 
 namespace spot
 {