diff --git a/tools/pyboard.py b/tools/pyboard.py
index c5c12c95b7..7b546b99d1 100755
--- a/tools/pyboard.py
+++ b/tools/pyboard.py
@@ -68,6 +68,7 @@ Or:
 """
 
 import ast
+import errno
 import os
 import struct
 import sys