diff --git a/test/prism/locals_test.rb b/test/prism/locals_test.rb
index 2c0036289c..c48b295a49 100644
--- a/test/prism/locals_test.rb
+++ b/test/prism/locals_test.rb
@@ -140,14 +140,17 @@ module Prism
         case node
         when BlockNode, DefNode, LambdaNode
           names = node.locals
-          params =
-            if node.is_a?(DefNode)
-              node.parameters
-            elsif node.parameters.is_a?(NumberedParametersNode)
-              nil
-            else
-              node.parameters&.parameters
-            end
+          params = nil
+
+          if node.is_a?(DefNode)
+            params = node.parameters
+          elsif node.parameters.is_a?(NumberedParametersNode)
+            # nothing
+          elsif node.parameters.is_a?(ItParametersNode)
+            names << AnonymousLocal
+          else
+            params = node.parameters&.parameters
+          end
 
           # prism places parameters in the same order that they appear in the
           # source. CRuby places them in the order that they need to appear