diff --git a/tool/stlinkv2.py b/tool/stlinkv2.py
index 8597ab7..3d88634 100755
--- a/tool/stlinkv2.py
+++ b/tool/stlinkv2.py
@@ -562,6 +562,7 @@ def main(show_help, erase_only, no_protect, spi_flash_check,
     if unlock:
         stl.reset_sys()
         stl.option_bytes_write(OPTION_BYTES_ADDR,RDP_KEY)
+        stl.finish_gpio()
         print "Flash ROM read protection disabled.  Reset the board, now."
         return 0