diff --git a/libcxx/utils/ssh.py b/libcxx/utils/ssh.py
--- a/libcxx/utils/ssh.py
+++ b/libcxx/utils/ssh.py
@@ -16,6 +16,7 @@
 
 import argparse
 import os
+import pipes
 import posixpath
 import shlex
 import subprocess
@@ -107,7 +108,7 @@
         commandLine = (pathOnRemote(x) if isTestExe(x) else x for x in commandLine)
         remoteCommands.append('cd {}'.format(tmp))
         if args.env:
-            remoteCommands.append('export {}'.format(' '.join(args.env)))
+            remoteCommands.append('export {}'.format(pipes.quote(' '.join(args.env))))
         remoteCommands.append(subprocess.list2cmdline(commandLine))
 
         # Finally, SSH to the remote host and execute all the commands.