diff --git a/micropython/drivers/storage/sdcard/sdcard.py b/micropython/drivers/storage/sdcard/sdcard.py
index 3df4788a2..99d251d71 100644
--- a/micropython/drivers/storage/sdcard/sdcard.py
+++ b/micropython/drivers/storage/sdcard/sdcard.py
@@ -154,7 +154,7 @@ def cmd(self, cmd, arg, crc, final=0, release=True, skip1=False):
         buf[2] = arg >> 16
         buf[3] = arg >> 8
         buf[4] = arg
-        buf[5] = crc
+        buf[5] = crc | 0x01  # ensure stop bit is always set
         self.spi.write(buf)
 
         if skip1: