diff --git a/dll/shellext/shellbtrfs/send.h b/dll/shellext/shellbtrfs/send.h
index 7940c4f19f0..7735c61b135 100644
--- a/dll/shellext/shellbtrfs/send.h
+++ b/dll/shellext/shellbtrfs/send.h
@@ -19,6 +19,7 @@
 
 #ifdef __REACTOS__
 #include "btrfs.h"
+#include <stdlib.h>
 #else
 #include "../btrfs.h"
 #endif