diff --git a/pts/Makefile b/pts/Makefile
index 07f9b96..d6b483b 100644
--- a/pts/Makefile
+++ b/pts/Makefile
@@ -1,7 +1,7 @@
 
 CC=gcc
 
-FLAGS= -Wall -O2 -D_GNU_SOURCE
+FLAGS= -Wall -O2 -D_GNU_SOURCE -Wno-unused-but-set-variable
 
 all:
 	$(CC) $(FLAGS) tty0tty.c -o tty0tty
diff --git a/pts/tty0tty.c b/pts/tty0tty.c
index 161e5b6..22c526b 100644
--- a/pts/tty0tty.c
+++ b/pts/tty0tty.c
@@ -141,7 +141,7 @@ copydata(int fdfrom, int fdto)
     if (bw <= 0)
     {
       // kernel buffer may be full, but we can recover
-      fprintf(stderr, "Write error, br=%d bw=%d\n", br, bw);
+      fprintf(stderr, "Write error, br=%d bw=%d\n", (int) br, (int) bw);
       usleep(500000);
       // discard input
       while (read(fdfrom, buffer, 1024) > 0)