diff --git a/grudge/version.py b/grudge/version.py
index 4b139fed..9ee4d2e7 100644
--- a/grudge/version.py
+++ b/grudge/version.py
@@ -4,7 +4,7 @@
 def _parse_version(version: str) -> tuple[tuple[int, ...], str]:
     import re
 
-    m = re.match("^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
+    m = re.match(r"^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
     assert m is not None
 
     return tuple(int(nr) for nr in m.group(1).split(".")), m.group(2)