diff --git a/libbb/make_directory.c b/libbb/make_directory.c
index e2e28a8cd..54d9b4c51 100644
--- a/libbb/make_directory.c
+++ b/libbb/make_directory.c
@@ -25,6 +25,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <stdlib.h>
 
 #include "libbb.h"