diff --git a/setup.py b/setup.py
index e3a60aeeb..6abcd2ada 100755
--- a/setup.py
+++ b/setup.py
@@ -246,7 +246,7 @@ def test_compile(
     stdin = p.stdin
     assert stdin is not None
     try:
-        stdin.write(src.encode('utf-8'))
+        stdin.write((src + '\n').encode('utf-8'))
         stdin.close()
     except BrokenPipeError:
         return False