diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index c4e3adfb534..56a8e396590 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -265,6 +265,13 @@ class CmdLineTest(unittest.TestCase):
             "print(repr(input()))",
             b"'abc'")
 
+    def test_unmached_quote(self):
+        # Issue #10206: python program starting with unmatched quote
+        # spewed spaces to stdout
+        rc, out, err = assert_python_failure('-c', "'")
+        self.assertRegex(err.decode('ascii', 'ignore'), 'SyntaxError')
+        self.assertEqual(b'', out)
+
 
 def test_main():
     test.support.run_unittest(CmdLineTest)
diff --git a/Misc/ACKS b/Misc/ACKS
index d578c483f13..06853b9535c 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -122,6 +122,7 @@ Jean Brouwers
 Gary S. Brown
 Oleg Broytmann
 Dave Brueck
+Francisco Martín Brugué
 Stan Bubrouski
 Erik de Bueger
 Dick Bulterman