diff --git a/aider/commands.py b/aider/commands.py
index d82d9a702..8ab881ec8 100644
--- a/aider/commands.py
+++ b/aider/commands.py
@@ -165,7 +165,10 @@ class Commands:
         return inp[0] in "/!"
 
     def get_raw_completions(self, cmd):
+        assert cmd.startswith("/")
+        cmd = cmd[1:]
         cmd = cmd.replace("-", "_")
+
         raw_completer = getattr(self, f"completions_raw_{cmd}", None)
         return raw_completer