Fix import.

btimby · btimby · commit b1aba021c78f · 2024-03-05T15:49:08.000-05:00
Signed-off-by: Ben Timby &lt;btimby@gmail.com&gt;
diff --git a/prometheus_client/values.py b/prometheus_client/values.py
@@ -1,5 +1,5 @@
 import os
-from threading import Lock
+from threading import RLock
 import warnings
 
 from .mmap_dict import mmap_key, MmapedDict
