diff --git a/reactos/tools/cat.c b/reactos/tools/cat.c
index 2bedf0a44b0..79e0741b744 100644
--- a/reactos/tools/cat.c
+++ b/reactos/tools/cat.c
@@ -8,7 +8,6 @@
  *                  Hermès Bélusca - Maïto
  */
 
-#include <io.h>
 #include <fcntl.h>
 #include <stdio.h>