diff --git a/include/busybox.h b/include/busybox.h
index 28ea2530f..ba4edcaba 100644
--- a/include/busybox.h
+++ b/include/busybox.h
@@ -27,6 +27,7 @@
 #include "config.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdarg.h>
 #include <sys/stat.h>
 #include <sys/types.h>
diff --git a/include/libbb.h b/include/libbb.h
index 86e4fbea7..15e3e49cf 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -25,6 +25,7 @@
 #define	__LIBCONFIG_H__    1
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdarg.h>
 #include <sys/stat.h>
 #include <sys/types.h>