diff --git a/test/t40c.c b/test/t40c.c
index c51622909..7cdfeef3e 100644
--- a/test/t40c.c
+++ b/test/t40c.c
@@ -21,8 +21,8 @@
 #include <sys/wait.h>
 #include <string.h>
 
-#define TERMINALW "/dev/ttyp0"
-#define TERMINALR "/dev/ptyp0"
+#define TERMINALW "/dev/ttypf"
+#define TERMINALR "/dev/ptypf"
 #define SENDSTRING "minixrocks"
 #define MAX_ERROR 5