diff -urN busybox-1.00-pre2.org/coreutils/tee.c busybox-1.00-pre2/coreutils/tee.c
--- busybox-1.00-pre2.org/coreutils/tee.c	2003-08-02 23:31:11.000000000 +0200
+++ busybox-1.00-pre2/coreutils/tee.c	2003-08-02 23:32:33.000000000 +0200
@@ -89,6 +89,7 @@
 #endif
 
 #else
+	setvbuf(stdout, NULL, _IONBF, 0);
 	while ((c = getchar()) != EOF) {
 		for (p=files ; *p ; p++) {
 			putc(c, *p);