diff --git a/client/flash.c b/client/flash.c
index 40c38439f..2d843e183 100644
--- a/client/flash.c
+++ b/client/flash.c
@@ -9,6 +9,7 @@ BOOL UsbConnect(void);
 
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #include "flash.h"
 #include "elf.h"
 
diff --git a/client/flasher.c b/client/flasher.c
index 3af52f832..d6a51f3e9 100644
--- a/client/flasher.c
+++ b/client/flasher.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include "proxusb.h"
 #include "flash.h"