diff --git a/letsencrypt/display/dummy_readline.py b/letsencrypt/display/dummy_readline.py
new file mode 100644
index 000000000..fb3d807bb
--- /dev/null
+++ b/letsencrypt/display/dummy_readline.py
@@ -0,0 +1,21 @@
+"""A dummy module with no effect for use on systems without readline."""
+
+
+def get_completer():
+    """An empty implementation of readline.get_completer."""
+
+
+def get_completer_delims():
+    """An empty implementation of readline.get_completer_delims."""
+
+
+def parse_and_bind(unused_command):
+    """An empty implementation of readline.parse_and_bind."""
+
+
+def set_completer(unused_function=None):
+    """An empty implementation of readline.set_completer."""
+
+
+def set_completer_delims(unused_delims):
+    """An empty implementation of readline.set_completer_delims."""