diff --git a/lib/adapter/cmd.py b/lib/adapter/cmd.py
index 7ecbdf30..be1df97f 100644
--- a/lib/adapter/cmd.py
+++ b/lib/adapter/cmd.py
@@ -133,7 +133,7 @@ def _get_command(self, topic, request_options=None):
         # Replace all non (alphanumeric, '-') chars with Spaces to delimit args to oeis.sh
         if topic.startswith("oeis/"):
             topic = topic[5:]
-            topic = re.sub('[^a-zA-Z0-9-]', ' ', topic)
+            topic = re.sub('[^a-zA-Z0-9-]+', ' ', topic)
 
         return cmd + [topic]