diff --git a/ChangeLog b/ChangeLog
index e72fd2249..67939d829 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2004-12-08  Alexandre Duret-Lutz  <adl@src.lip6.fr>
+
+	* src/misc/random.hh: Add include guard.
+
 2004-12-07  Alexandre Duret-Lutz  <adl@src.lip6.fr>
 
 	* src/misc/random.hh (nrand, bmrand, prand): New functions.
diff --git a/src/misc/random.hh b/src/misc/random.hh
index 9427e3d1f..9a4247806 100644
--- a/src/misc/random.hh
+++ b/src/misc/random.hh
@@ -19,7 +19,10 @@
 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 // 02111-1307, USA.
 
-#include <cmath>
+#ifndef SPOT_MISC_RANDOM_HH
+# define SPOT_MISC_RANDOM_HH
+
+# include <cmath>
 
 namespace spot
 {
@@ -114,3 +117,5 @@ namespace spot
   int prand(double p);
   /// @}
 }
+
+#endif // SPOT_MISC_RANDOM_HH