diff --git a/Lib/notobuilder/__main__.py b/Lib/notobuilder/__main__.py
index 98dd5ca..7dd2409 100644
--- a/Lib/notobuilder/__main__.py
+++ b/Lib/notobuilder/__main__.py
@@ -46,7 +46,7 @@ def main(args=None):
     if args.graph:
         pd.draw_graph()
     if not args.no_ninja:
-        result = subprocess.run(["ninja"])
+        result = subprocess.run(["ninja", "-f", pd.ninja_file_name])
         sys.exit(result.returncode)