diff --git a/parlai/core/params.py b/parlai/core/params.py
index da199fb371c..1e7ab67415d 100644
--- a/parlai/core/params.py
+++ b/parlai/core/params.py
@@ -310,7 +310,7 @@ def __init__(
 
         super().__init__(
             description=description,
-            allow_abbrev=True,
+            allow_abbrev=False,
             conflict_handler='resolve',
             add_help=True,
             **kwargs,