diff --git a/svn_mirror/svn.py b/svn_mirror/svn.py
index 87203e9..91356b9 100644
--- a/svn_mirror/svn.py
+++ b/svn_mirror/svn.py
@@ -32,12 +32,16 @@ def _run_svn(args: list, input: bytes = None, timeout: int = 120,
              auth_args: Optional[list] = None) -> subprocess.CompletedProcess:
     if auth_args:
         args = auth_args + args
+    args = ["--non-interactive"] + args
+    env = {**os.environ, "LC_ALL": "C.UTF-8"}
     try:
         r = subprocess.run(
             ["svn"] + args,
+            stdin=subprocess.DEVNULL,
             input=input,
             capture_output=True,
             timeout=timeout,
+            env=env,
         )
     except FileNotFoundError:
         raise SVNError("svn CLI not found – is subversion installed?")