diff --git a/asterixdb/asterix-doc/src/main/grammar/sqlpp.ebnf b/asterixdb/asterix-doc/src/main/grammar/sqlpp.ebnf
index b237f30..80f2bc2 100644
--- a/asterixdb/asterix-doc/src/main/grammar/sqlpp.ebnf
+++ b/asterixdb/asterix-doc/src/main/grammar/sqlpp.ebnf
@@ -162,7 +162,7 @@
 
 CreateType ::= "CREATE" "TYPE" QualifiedName ("IF" "NOT" "EXISTS")? "AS" ObjectTypeDef
 
-ObjectTypeDef ::= ("CLOSED" | "OPEN")? "{" ObjectField ("," ObjectField)* "}"
+ObjectTypeDef ::= ("CLOSED" | "OPEN")? "{" ( ObjectField ("," ObjectField)* )? "}"
 
 ObjectField ::= Identifier ":" Identifier "?"?