diff --git a/contrib/cldis.py b/contrib/cldis.py
index d41cb0ba8683a3a6e1b5d1d9cedacd60037bdabc..d54fc91a5a541aca7143fb8d2a7d00763a13e8a7 100644
--- a/contrib/cldis.py
+++ b/contrib/cldis.py
@@ -64,7 +64,7 @@ def main(ctx, tmp_dir, cl_str, output=None, build_options=()):
             if output == "sass":
                 with open(os.path.join(tmp_dir, "cl.ptx"), "w") as f:
                     f.write(res)
-                tgt = re.findall(".target sm_[0-9]*", res, re.MULTILINE)[0]
+                tgt = re.findall(r".target sm_[0-9]*", res, re.MULTILINE)[0]
                 gpu_name = tgt[8:]
                 subprocess.check_call(["ptxas", "cl.ptx", "--verbose",
                     f"--gpu-name={gpu_name}", "--warn-on-spills"], cwd=tmp_dir)
diff --git a/pyopencl/version.py b/pyopencl/version.py
index 9f9011963f53eee25014ad923ea9713128b5c6de..2cd0fffdb69a235bb2d4f0e04db0466d6da619c3 100644
--- a/pyopencl/version.py
+++ b/pyopencl/version.py
@@ -3,7 +3,7 @@ from importlib import metadata
 
 
 VERSION_TEXT = metadata.version("pyopencl")
-_match = re.match("^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
+_match = re.match(r"^([0-9.]+)([a-z0-9]*?)$", VERSION_TEXT)
 assert _match is not None
 VERSION_STATUS = _match.group(2)
 VERSION = tuple(int(nr) for nr in _match.group(1).split("."))