diff --git a/builder/family/beken-72xx.py b/builder/family/beken-72xx.py
index d558f3a..12cef25 100644
--- a/builder/family/beken-72xx.py
+++ b/builder/family/beken-72xx.py
@@ -528,7 +528,7 @@ queue.BuildLibraries()
 # Rename Arduino's delay() to delayMilliseconds()
 env.Append(
     CPPDEFINES=[
-        ("delay(ms)", "delayMilliseconds(ms)"),
+        ("'delay(ms)'", "'delayMilliseconds(ms)'"),
     ],
 )