diff --git a/src/interpreter/__interpreter.py b/src/interpreter/__interpreter.py
index 735a925..69c1e1c 100644
--- a/src/interpreter/__interpreter.py
+++ b/src/interpreter/__interpreter.py
@@ -19,7 +19,7 @@ OPCODE_ERROR_ILLEGAL = (
 
 
 def opcode(opcode: Operation):
-    assert type(opcode) == Operation, OPCODE_ERROR_TYPE_CHECK
+    assert type(opcode) is Operation, OPCODE_ERROR_TYPE_CHECK
 
     def _helper(func: Callable):
         setattr(func, OPCODE_HEADER, opcode)