--- squashfs-tools/mksquashfs.c
+++ squashfs-tools/mksquashfs.c
@@ -1832,17 +1832,17 @@
 	if(!progress || columns - used < 0)
 		return;
 
-	printf("\r[");
+	fprintf(stderr, "\r[");
 
 	while (hashes --)
-		putchar('=');
+		putc('=', stderr);
 
 	while(spaces --)
-		putchar(' ');
+		putc(' ', stderr);
 
-	printf("] %*lld/%*lld", max_digits, current, max_digits, max);
-	printf(" %3lld%%", current * 100 / max);
-	fflush(stdout);
+	fprintf(stderr, "] %*lld/%*lld", max_digits, current, max_digits, max);
+	fprintf(stderr, " %3lld%%", current * 100 / max);
+	fflush(stderr);
 }