diff --git a/graphql-c_parser/lib/graphql/c_parser.rb b/graphql-c_parser/lib/graphql/c_parser.rb
index bda215ccf1..363fe7cf4a 100644
--- a/graphql-c_parser/lib/graphql/c_parser.rb
+++ b/graphql-c_parser/lib/graphql/c_parser.rb
@@ -75,7 +75,6 @@ def self.tokenize(graphql_string, intern_identifiers: false, max_tokens: nil)
               1,
               1,
               graphql_string,
-              nil, # prev token
               241 # BAD_UNICODE_ESCAPE in lexer.rl
             ]
           ]