diff --git a/tools/ci_build/build.py b/tools/ci_build/build.py
index 5435d9593f..698ec37e95 100644
--- a/tools/ci_build/build.py
+++ b/tools/ci_build/build.py
@@ -2719,7 +2719,8 @@ def main():
     args = parse_arguments()
 
     print(args)
-
+    if not args.use_vcpkg:
+        sys.exit(1)
     if os.getenv("ORT_BUILD_WITH_CACHE") == "1":
         args.use_cache = True