diff --git a/src/common/memfill.c b/src/common/memfill.c
index ee47e1a..c53bfea 100644
--- a/src/common/memfill.c
+++ b/src/common/memfill.c
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <string.h>
 #include <errno.h>
 #include <sys/resource.h>