diff --git a/src/tm_mad/lib/shell.rb b/src/tm_mad/lib/shell.rb
index 401799d1ba..bcb929a73f 100644
--- a/src/tm_mad/lib/shell.rb
+++ b/src/tm_mad/lib/shell.rb
@@ -304,7 +304,7 @@ def self.sshwrap(host, cmd)
         cmd
       else
         <<~EOF.strip
-          ssh '#{host}' '\
+          ssh -n '#{host}' '\
               script="$(mktemp)"; \
               echo "#{Base64.strict_encode64(cmd)}" | base64 -d > "$script"; \
               trap "rm $script" EXIT; \