diff --git a/lib/lrama/grammar/rule_builder.rb b/lib/lrama/grammar/rule_builder.rb
index 4730cc39..c17a4048 100644
--- a/lib/lrama/grammar/rule_builder.rb
+++ b/lib/lrama/grammar/rule_builder.rb
@@ -102,7 +102,7 @@ def process_rhs(parameterizing_resolver)
           when Lrama::Lexer::Token::Ident
             @replaced_rhs << token
           when Lrama::Lexer::Token::InstantiateRule
-            if parameterizing_resolver.defined?(token.s_value)
+            if parameterizing_resolver.defined?(token.rule_name)
               parameterizing = parameterizing_resolver.build_rules(token, @rule_counter, @lhs_tag, line)
               @parameterizing_rules = @parameterizing_rules + parameterizing.map(&:rules).flatten
               @replaced_rhs = @replaced_rhs + parameterizing.map(&:token).flatten.uniq
diff --git a/lib/lrama/lexer/token/instantiate_rule.rb b/lib/lrama/lexer/token/instantiate_rule.rb
index 90f7c5ec..9b703dd9 100644
--- a/lib/lrama/lexer/token/instantiate_rule.rb
+++ b/lib/lrama/lexer/token/instantiate_rule.rb
@@ -8,6 +8,10 @@ def initialize(s_value:, alias_name: nil, location: nil, args: [])
           super s_value: s_value, alias_name: alias_name, location: location
           @args = args
         end
+
+        def rule_name
+          s_value
+        end
       end
     end
   end
diff --git a/sig/lrama/lexer/token/instantiate_rule.rbs b/sig/lrama/lexer/token/instantiate_rule.rbs
index edad8508..3a017dbf 100644
--- a/sig/lrama/lexer/token/instantiate_rule.rbs
+++ b/sig/lrama/lexer/token/instantiate_rule.rbs
@@ -5,6 +5,7 @@ module Lrama
         attr_accessor args: Array[Lexer::Token]
 
         def initialize: (s_value: String, ?alias_name: String, ?location: Location, ?args: Array[Lexer::Token]) -> void
+        def rule_name: () -> String
       end
     end
   end