diff --git a/ntunnel.py b/ntunnel.py
index e8623c6..3aea98b 100644
--- a/ntunnel.py
+++ b/ntunnel.py
@@ -671,6 +671,9 @@ class TestMain(unittest.TestCase):
 			if proc.returncode is None:
 				proc.terminate()
 
+			# Make sure that process exits before continuing
+			await proc.wait()
+
 	@async_test
 	async def test_noargs(self):
 		async with self.run_with_args() as proc: