diff --git a/CHANGES/2497.bugfix b/CHANGES/2497.bugfix
new file mode 100644
index 00000000000..0c640a4a1f9
--- /dev/null
+++ b/CHANGES/2497.bugfix
@@ -0,0 +1 @@
+Ignore `NotImplementedError` raised by `set_child_watcher` from `uvloop`.
diff --git a/aiohttp/test_utils.py b/aiohttp/test_utils.py
index 8a2caad4cc9..cd8cf7aa0f1 100644
--- a/aiohttp/test_utils.py
+++ b/aiohttp/test_utils.py
@@ -430,7 +430,8 @@ def setup_test_loop(loop_factory=asyncio.new_event_loop):
         policy = asyncio.get_event_loop_policy()
         watcher = asyncio.SafeChildWatcher()
         watcher.attach_loop(loop)
-        policy.set_child_watcher(watcher)
+        with contextlib.suppress(NotImplementedError):
+            policy.set_child_watcher(watcher)
     return loop