diff --git a/build.py b/build.py
index 26d3892..2741812 100755
--- a/build.py
+++ b/build.py
@@ -117,7 +117,7 @@ def calculate_hash(filename: Path):
 
 def download_file(file: DownloadInfo, filename: Path):
     if not filename.exists():
-        filename.parent.mkdir(exist_ok=True)
+        filename.parent.mkdir(exist_ok=True, parents=True)
         print(f"Downloading new file {file['url']}")
         urllib.request.urlretrieve(file["url"], filename)
     sha1 = calculate_hash(filename)
@@ -158,7 +158,7 @@ def build_version(manifest: VersionManifest, version_id: str, repository: str =
     java_version = version['javaVersion']
     print(
         f"Version [{version['type']}] {version['id']} requires java version {java_version['majorVersion']} ({java_version['component']})")
-    server_jar_file = Path(f"versions/{version['id']}/server.jar")
+    server_jar_file = Path("versions") / version['id'] / "server.jar"
     server_jar = version["downloads"]["server"]
     download_file(server_jar, server_jar_file)