diff --git a/pio-scripts/set_nightly_version.py b/pio-scripts/set_nightly_version.py
index b069e777..176cd988 100644
--- a/pio-scripts/set_nightly_version.py
+++ b/pio-scripts/set_nightly_version.py
@@ -6,6 +6,6 @@ from datetime import datetime, timezone
 if os.environ.get('WLED_NIGHTLY_BUILD') == 'true':
     # VERSION format: yymmddb (b = build number, 0 for nightly)
     version_code = datetime.now(timezone.utc).strftime("%y%m%d") + "0"
-    env.Append(BUILD_FLAGS=[f"-DVERSION={version_code}"])
+    env.Append(BUILD_FLAGS=[f"-DWLED_BUILD_VERSION={version_code}"])
     print(f"Nightly build: Setting VERSION to {version_code}")