diff --git a/lib/rbs/test/guaranteed.rb b/lib/rbs/test/guaranteed.rb
index 4a1e34e6a..1406eff6f 100644
--- a/lib/rbs/test/guaranteed.rb
+++ b/lib/rbs/test/guaranteed.rb
@@ -10,8 +10,7 @@ module Inspect
 
         module_function def guaranteed_inspect(obj)
           obj.inspect
-        rescue NoMethodError => err
-          raise unless err.name == :inspect && EQUAL.bind_call(obj, err.receiver)
+        rescue NoMethodError
           INSPECT.bind_call(obj)
         end
 
@@ -20,7 +19,7 @@ def inspect
 
           instance_variables.each_with_index do |variable, index|
             string.concat ', ' unless index.zero?
-            string.concat "#{variable}: #{guaranteed_inspect(variable)}"
+            string.concat "#{variable}: #{guaranteed_inspect(instance_variable_get(variable))}"
           end
 
           string.concat '>'