diff --git a/src/drc/drc/built-in-macros/drc_interpreters.lym b/src/drc/drc/built-in-macros/drc_interpreters.lym
index 720b7e963..fbcdd0091 100644
--- a/src/drc/drc/built-in-macros/drc_interpreters.lym
+++ b/src/drc/drc/built-in-macros/drc_interpreters.lym
@@ -91,7 +91,7 @@ module DRC
       macro = RBA::Macro::macro_by_path(script)
       macro || raise("Can't find DRC script #{script} - unable to re-run")
 
-      DRCExecutable::new(macro, @interpreter, self.generator("script" => script), params["rdb_index"])
+      DRCExecutable::new(macro, @interpreter, self.generator({ "script" => script }, 0), params["rdb_index"])
       
     end
 
@@ -128,7 +128,7 @@ module DRC
     
     # Implements the execute method
     def executable(macro)
-      DRCExecutable::new(macro, self, @recipe.generator("script" => macro.path))
+      DRCExecutable::new(macro, self, @recipe.generator({"script" => macro.path}, 0))
     end
     
   end
@@ -155,7 +155,7 @@ module DRC
     
     # Implements the execute method
     def executable(macro)
-      DRCExecutable::new(macro, self, @recipe.generator("script" => macro.path))
+      DRCExecutable::new(macro, self, @recipe.generator({ "script" => macro.path }, 0))
     end
     
   end
diff --git a/src/gsi/gsi/gsiDeclTl.cc b/src/gsi/gsi/gsiDeclTl.cc
index 3f427ae6c..0b891508f 100644
--- a/src/gsi/gsi/gsiDeclTl.cc
+++ b/src/gsi/gsi/gsiDeclTl.cc
@@ -693,6 +693,16 @@ static Recipe_Impl *make_recipe (const std::string &name, const std::string &des
   return new Recipe_Impl (name, description);
 }
 
+static tl::Variant make_impl (Recipe_Impl *recipe, const std::string &generator, const std::map<std::string, tl::Variant> &add_params, int /*dummy*/)
+{
+  return recipe->make (generator, add_params);
+}
+
+std::string generator_impl (Recipe_Impl *recipe, const std::map<std::string, tl::Variant> &params, int /*dummy*/)
+{
+  return recipe->generator (params);
+}
+
 Class<Recipe_Impl> decl_Recipe_Impl ("tl", "Recipe",
   gsi::constructor ("new", &make_recipe, gsi::arg ("name"), gsi::arg ("description", std::string (), "\"\""),
     "@brief Creates a new recipe object with the given name and (optional) description"
@@ -703,15 +713,23 @@ Class<Recipe_Impl> decl_Recipe_Impl ("tl", "Recipe",
   gsi::method ("description", &Recipe_Impl::description,
     "@brief Gets the description of the recipe."
   ) +
-  gsi::method ("make", &Recipe_Impl::make, gsi::arg ("generator"), gsi::arg ("add_params", std::map<std::string, tl::Variant> (), "{}"),
+  gsi::method_ext ("make", &make_impl, gsi::arg ("generator"), gsi::arg ("add_params", std::map<std::string, tl::Variant> (), "{}"), gsi::arg ("dummy", 0),
     "@brief Executes the recipe given by the generator string.\n"
     "The generator string is the one delivered with \\generator.\n"
     "Additional parameters can be passed in \"add_params\". They have lower priority than the parameters "
     "kept inside the generator string."
+    "\n"
+    "The dummy argument has been added in version 0.29 and disambiguates between keyword parameters "
+    "and a single hash argument in Ruby. This is required for Ruby versions before 'real keywords'. Simply "
+    "add this parameter with any value.\n"
   ) +
-  gsi::method ("generator", &Recipe_Impl::generator, gsi::arg ("params"),
+  gsi::method_ext ("generator", &generator_impl, gsi::arg ("params"), gsi::arg ("dummy", 0),
     "@brief Delivers the generator string from the given parameters.\n"
     "The generator string can be used with \\make to re-run the recipe."
+    "\n"
+    "The dummy argument has been added in version 0.29 and disambiguates between keyword parameters "
+    "and a single hash argument in Ruby. This is required for Ruby versions before 'real keywords'. Simply "
+    "add this parameter with any value.\n"
   ) +
   gsi::callback ("executable", &Recipe_Impl::executable, &Recipe_Impl::executable_cb, gsi::arg ("params"),
     "@brief Reimplement this method to provide an executable object for the actual implementation.\n"
diff --git a/src/lvs/lvs/built-in-macros/lvs_interpreters.lym b/src/lvs/lvs/built-in-macros/lvs_interpreters.lym
index 2aaf6f1fa..73ff49907 100644
--- a/src/lvs/lvs/built-in-macros/lvs_interpreters.lym
+++ b/src/lvs/lvs/built-in-macros/lvs_interpreters.lym
@@ -91,7 +91,7 @@ module LVS
       macro = RBA::Macro::macro_by_path(script)
       macro || raise("Can't find LVS script #{script} - unable to re-run")
 
-      LVSExecutable::new(macro, @interpreter, self.generator("script" => script), params["l2ndb_index"])
+      LVSExecutable::new(macro, @interpreter, self.generator({ "script" => script }, 0), params["l2ndb_index"])
       
     end
 
@@ -128,7 +128,7 @@ module LVS
     
     # Implements the execute method
     def executable(macro)
-      LVSExecutable::new(macro, self, @recipe.generator("script" => macro.path))
+      LVSExecutable::new(macro, self, @recipe.generator({ "script" => macro.path }, 0))
     end
     
   end
@@ -155,7 +155,7 @@ module LVS
     
     # Implements the execute method
     def executable(macro)
-      LVSExecutable::new(macro, self, @recipe.generator("script" => macro.path))
+      LVSExecutable::new(macro, self, @recipe.generator({ "script" => macro.path }, 0))
     end
     
   end
diff --git a/src/plugins/tools/view_25d/lay_plugin/built-in-macros/d25_interpreters.lym b/src/plugins/tools/view_25d/lay_plugin/built-in-macros/d25_interpreters.lym
index fd8e1bca5..5d0e4ff61 100644
--- a/src/plugins/tools/view_25d/lay_plugin/built-in-macros/d25_interpreters.lym
+++ b/src/plugins/tools/view_25d/lay_plugin/built-in-macros/d25_interpreters.lym
@@ -92,7 +92,7 @@ module D25
       macro = RBA::Macro::macro_by_path(script)
       macro || raise("Can't find D25 script #{script} - unable to re-run")
 
-      D25Executable::new(macro, @interpreter, self.generator("script" => script))
+      D25Executable::new(macro, @interpreter, self.generator({ "script" => script }, 0))
       
     end
 
@@ -129,7 +129,7 @@ module D25
     
     # Implements the execute method
     def executable(macro)
-      D25Executable::new(macro, self, @recipe.generator("script" => macro.path))
+      D25Executable::new(macro, self, @recipe.generator({ "script" => macro.path }, 0))
     end
     
   end
@@ -156,7 +156,7 @@ module D25
     
     # Implements the execute method
     def executable(macro)
-      D25Executable::new(macro, self, @recipe.generator("script" => macro.path))
+      D25Executable::new(macro, self, @recipe.generator({ "script" => macro.path }, 0))
     end
     
   end
diff --git a/testdata/ruby/tlTest.rb b/testdata/ruby/tlTest.rb
index 6a6f996d6..a77b8ae75 100644
--- a/testdata/ruby/tlTest.rb
+++ b/testdata/ruby/tlTest.rb
@@ -301,10 +301,10 @@ class Tl_TestClass < TestBase
     assert_equal(my_recipe.name, "rba_test_recipe")
     assert_equal(my_recipe.description, "description")
 
-    g = my_recipe.generator({ "A" => 6, "B" => 7.0 })
+    g = my_recipe.generator({ "A" => 6, "B" => 7.0 }, 0)
     assert_equal(g, "rba_test_recipe: A=#6,B=##7")
     assert_equal("%g" % RBA::Recipe::make(g), "42")
-    assert_equal("%g" % RBA::Recipe::make(g, { "C" => 1.5 }).to_s, "63")
+    assert_equal("%g" % RBA::Recipe::make(g, { "C" => 1.5 }, 0).to_s, "63")
 
     my_recipe._destroy
     my_recipe = nil