diff --git a/tests/extmod/uctypes_ptr_le.py b/tests/extmod/uctypes_ptr_le.py
index d2ceb76f47..411799db5f 100644
--- a/tests/extmod/uctypes_ptr_le.py
+++ b/tests/extmod/uctypes_ptr_le.py
@@ -1,3 +1,4 @@
+import sys
 import uctypes
 
 if sys.byteorder != "little":