diff --git a/grammar/src/lexical.grm b/grammar/src/lexical.grm
index de688c15bed..a911b6817d3 100644
--- a/grammar/src/lexical.grm
+++ b/grammar/src/lexical.grm
@@ -60,8 +60,6 @@ else
 while
 do
 match
-extension
-
 
 Soft:
 wraps -- in a class header
@@ -72,7 +70,7 @@ get, set -- in a property definition
 abstract
 virtual
 enum
-extendable -- or open
+open
 attribute
 override
 private