diff --git a/lsflib/include/lsf/lsf.h b/lsflib/include/lsf/lsf.h
--- a/lsflib/include/lsf/lsf.h
+++ b/lsflib/include/lsf/lsf.h
@@ -11,6 +11,7 @@
 #endif
 
 #include <stdio.h>
+#include <stdlib.h>
 #ifndef __LIST__H
 #include <lsf/list.h>
 #endif