diff --git a/examples/H5Block/read_write_scalar_field.c b/examples/H5Block/read_write_scalar_field.c
index ef56d67..047457a 100644
--- a/examples/H5Block/read_write_scalar_field.c
+++ b/examples/H5Block/read_write_scalar_field.c
@@ -9,6 +9,8 @@
 
 #include "H5hut.h"
 
+#include <stdlib.h>
+
 #define NPROCS  8
 #define DEFAULT_VERBOSITY       H5_VERBOSE_DEFAULT