diff --git a/probe_scraper/parsers/third_party/usecounters.py b/probe_scraper/parsers/third_party/usecounters.py
index a0d79b8b..2b35d90e 100644
--- a/probe_scraper/parsers/third_party/usecounters.py
+++ b/probe_scraper/parsers/third_party/usecounters.py
@@ -17,7 +17,7 @@ def parse_counters(stream):
             if not line or line.startswith("//"):
                 # empty line or comment
                 continue
-            m = re.match(r"method ([A-Za-z0-9]+)\.([A-Za-z0-9]+)$", line)
+            m = re.match(r"method ([A-Za-z0-9]+)\.([A-Za-z0-9_]+)$", line)
             if m:
                 interface_name, method_name = m.groups()
                 yield {