diff --git a/tests/littlecheck.py b/tests/littlecheck.py
index a275c7dfd..58dd80fd6 100755
--- a/tests/littlecheck.py
+++ b/tests/littlecheck.py
@@ -390,8 +390,9 @@ def runproc(cmd, env=None):
 async def runproc_async(cmd, env=None, cwd=None):
     """Wrapper around subprocess.Popen to save typing"""
     PIPE = asyncio.subprocess.PIPE
+    DEVNULL = asyncio.subprocess.DEVNULL
     return await asyncio.create_subprocess_shell(
-        cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE, env=env, cwd=cwd
+        cmd, stdin=DEVNULL, stdout=PIPE, stderr=PIPE, env=env, cwd=cwd
     )