diff --git a/Tools/ardupilotwaf/boards.py b/Tools/ardupilotwaf/boards.py
index 7ff1f52a26..b58cb5c39d 100644
--- a/Tools/ardupilotwaf/boards.py
+++ b/Tools/ardupilotwaf/boards.py
@@ -175,6 +175,7 @@ class Board:
             '-Wno-reorder',
             '-Wno-redundant-decls',
             '-Wno-unknown-pragmas',
+            '-Wno-expansion-to-defined',
             '-Werror=attributes',
             '-Werror=format-security',
             '-Werror=enum-compare',