diff --git a/src/utils/smallut.h b/src/utils/smallut.h
index 351495cf..8bb0dd32 100644
--- a/src/utils/smallut.h
+++ b/src/utils/smallut.h
@@ -17,6 +17,8 @@
 #ifndef _SMALLUT_H_INCLUDED_
 #define _SMALLUT_H_INCLUDED_
 /* @(#$Id: smallut.h,v 1.33 2008-12-05 07:38:07 dockes Exp $  (C) 2004 J.F.Dockes */
+#include <stdlib.h>
+
 #include <string>
 #include <list>
 #include <vector>