diff --git a/lib/libstand/dosfs.c b/lib/libstand/dosfs.c
index 72205a2c648a..b75d752fdc23 100644
--- a/lib/libstand/dosfs.c
+++ b/lib/libstand/dosfs.c
@@ -786,7 +786,8 @@ static int
 ioget(struct open_file *fd, u_int lsec, void *buf, u_int nsec)
 {
     int	err;
-    
+
+    twiddle(1);
     if ((err = (fd->f_dev->dv_strategy)(fd->f_devdata, F_READ, lsec, 
 					secbyt(nsec), buf, NULL)))
 	return(err);