diff --git a/win_toolchain/get_toolchain_if_necessary.py b/win_toolchain/get_toolchain_if_necessary.py
index fb18ffc43..033c09101 100755
--- a/win_toolchain/get_toolchain_if_necessary.py
+++ b/win_toolchain/get_toolchain_if_necessary.py
@@ -121,7 +121,7 @@ def HaveSrcInternalAccess():
   """Checks whether access to src-internal is available."""
   with open(os.devnull, 'w') as nul:
     if subprocess.call(
-        ['svn', 'ls',
+        ['svn', 'ls', '--non-interactive',
          'svn://svn.chromium.org/chrome-internal/trunk/src-internal/'],
         shell=True, stdin=nul, stdout=nul, stderr=nul) == 0:
       return True