diff --git a/src/ttynvt.c b/src/ttynvt.c
index 14866be..a88ae3d 100644
--- a/src/ttynvt.c
+++ b/src/ttynvt.c
@@ -11,6 +11,7 @@
 #include <poll.h>
 #include <pthread.h>
 #include <signal.h>
+#include <stdint.h>
 #include <stdarg.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -791,8 +792,8 @@ ttynvt_ioctl(fuse_req_t req, int cmd, void *arg,
     int             mcr;
     int             val;
     int             res;
-    unsigned char   byte;
-    unsigned int    byte4;
+    uint8_t         byte;
+    uint32_t        byte4;
 
     DBG("%s: cmd=%s arg=%p ibuf=%p:%u obuf=:%u\n", __func__,
         _ioctl_name(cmd), arg, in_buf,