diff --git a/e2fsprogs/old_e2fsprogs/mke2fs.c b/e2fsprogs/old_e2fsprogs/mke2fs.c
index e44d986..ebcb46c 100644
--- a/e2fsprogs/old_e2fsprogs/mke2fs.c
+++ b/e2fsprogs/old_e2fsprogs/mke2fs.c
@@ -239,7 +239,7 @@
 	errcode_t	retval;
 	char		buf[1024];
 
-	sprintf(buf, "badblocks -b %d %s%s%s %d", fs->blocksize,
+	sprintf(buf, "badblocks -b %u %s%s%s %d", fs->blocksize,
 		quiet ? "" : "-s ", (cflag > 1) ? "-w " : "",
 		fs->device_name, fs->super->s_blocks_count);
 	mke2fs_verbose("Running command: %s\n", buf);