diff --git a/cfspeedtest/cloudflare.py b/cfspeedtest/cloudflare.py
index 682f796..7deaa80 100644
--- a/cfspeedtest/cloudflare.py
+++ b/cfspeedtest/cloudflare.py
@@ -7,6 +7,7 @@
 from __future__ import annotations
 
 import logging
+import re
 import statistics
 import time
 from enum import Enum
@@ -16,6 +17,8 @@
 
 log = logging.getLogger("cfspeedtest")
 
+TIMING_DURATION_RE = re.compile(r"dur=([0-9.]+)")
+
 
 class TestType(Enum):
     """The type of an individual test."""
@@ -97,12 +100,10 @@ def jitter_from(latencies: list[float]) -> float | None:
         """Compute jitter as average deviation between consecutive latencies."""
         if len(latencies) < 2:
             return None
-        return statistics.mean(
-            [
-                abs(latencies[i] - latencies[i - 1])
-                for i in range(1, len(latencies))
-            ]
-        )
+        return statistics.mean([
+            abs(latencies[i] - latencies[i - 1])
+            for i in range(1, len(latencies))
+        ])
 
 
 class TestMetadata(NamedTuple):
@@ -191,10 +192,8 @@ def run_test(self, test: TestSpec) -> TestTimers:
                 test.type.value, url, data=data, timeout=self.timeout
             )
             coll.full.append(time.time() - start)
-            coll.server.append(
-                float(r.headers["Server-Timing"].split(",")[0].split("=")[1])
-                / 1e3
-            )
+            timing_match = TIMING_DURATION_RE.search(r.headers["Server-Timing"])
+            coll.server.append(float(timing_match.group(1)) / 1e3)
             coll.request.append(
                 r.elapsed.seconds + r.elapsed.microseconds / 1e6
             )