diff --git a/bin/twnbuild b/bin/twnbuild
index 5821e74..e53c2b7 100755
--- a/bin/twnbuild
+++ b/bin/twnbuild
@@ -28,9 +28,8 @@ if "--" in argv:
 
 # if no root cmake file is present, infer it from `twn.toml:game.interpreter`
 if not Path("CMakeLists.txt").is_file():
-    with open("data/twn.toml", "rb") as f:
-        config = tomllib.load(f)
-        cmake += ["-S", expandvars(config["game"]["interpreter"])]
+    config = tomllib.loads(Path("data/twn.toml").read_text())
+    cmake += ["-S", expandvars(config["game"]["interpreter"])]
 
 run(cmake, check=True)
 run(["cmake", "--build", "build", "--parallel"], check=True)