diff --git a/ox/net.py b/ox/net.py
index 1fd4d87..696cabb 100644
--- a/ox/net.py
+++ b/ox/net.py
@@ -113,7 +113,8 @@ get_url = read_url
 def save_url(url, filename, overwrite=False):
     if not os.path.exists(filename) or overwrite:
         dirname = os.path.dirname(filename)
-        os.makedirs(dirname, exist_ok=True)
+        if dirname:
+            os.makedirs(dirname, exist_ok=True)
         headers = DEFAULT_HEADERS.copy()
         r = requests.get(url, headers=headers, stream=True)
         filename_tmp = filename + '~'