diff --git a/opshin/builder.py b/opshin/builder.py
index 75726f45..f3bb2d25 100644
--- a/opshin/builder.py
+++ b/opshin/builder.py
@@ -1,6 +1,7 @@
 import copy
 import dataclasses
 import enum
+import functools
 import json
 import types
 import typing
@@ -203,9 +204,9 @@ def compile(
     return plt_code
 
 
-def _compile(
+@functools.lru_cache(maxsize=32)
+def _static_compile(
     source_code: str,
-    *args: typing.Union[pycardano.Datum, uplc_ast.Constant],
     contract_file: str = "<unknown>",
     force_three_params=False,
     validator_function_name="validator",
@@ -229,7 +230,34 @@ def _compile(
         constant_folding=constant_folding,
         allow_isinstance_anything=allow_isinstance_anything,
     )
+    return code
+
+
+def _compile(
+    source_code: str,
+    *args: typing.Union[pycardano.Datum, uplc_ast.Constant],
+    contract_file: str = "<unknown>",
+    force_three_params=False,
+    validator_function_name="validator",
+    optimize_patterns=True,
+    remove_dead_code=True,
+    constant_folding=False,
+    allow_isinstance_anything=False,
+):
+    """
+    Expects a python module and returns the build artifacts from compiling it
+    """
 
+    code = _static_compile(
+        source_code,
+        contract_file=contract_file,
+        force_three_params=force_three_params,
+        validator_function_name=validator_function_name,
+        optimize_patterns=optimize_patterns,
+        remove_dead_code=remove_dead_code,
+        constant_folding=constant_folding,
+        allow_isinstance_anything=allow_isinstance_anything,
+    )
     code = _apply_parameters(code, *args)
     return code
 
diff --git a/opshin/compiler.py b/opshin/compiler.py
index 928ba6ab..9abc9ce1 100644
--- a/opshin/compiler.py
+++ b/opshin/compiler.py
@@ -855,7 +855,7 @@ def visit_ClassDef(self, node: TypedClassDef) -> CallAST:
 
     def visit_Attribute(self, node: TypedAttribute) -> plt.AST:
         assert isinstance(
-            node.typ, InstanceType
+            node.value.typ, InstanceType
         ), "Can only access attributes of instances"
         obj = self.visit(node.value)
         attr = node.value.typ.attribute(node.attr)
diff --git a/opshin/tests/test_misc.py b/opshin/tests/test_misc.py
index 3fa37b4b..633f385d 100644
--- a/opshin/tests/test_misc.py
+++ b/opshin/tests/test_misc.py
@@ -2885,3 +2885,42 @@ def validator(x: bool) -> str:
         """
         res_true = eval_uplc_value(source_code, 1)
         res_false = eval_uplc_value(source_code, 0)
+
+    @unittest.expectedFailure
+    def test_class_attribute_access(self):
+        source_code = """
+from dataclasses import dataclass
+from pycardano import Datum as Anything, PlutusData
+from typing import Dict, List, Union
+
+@dataclass
+class A(PlutusData):
+    CONSTR_ID = 15
+    a: int
+    b: bytes
+    d: List[int]
+
+def validator(_: None) -> int:
+    return A.CONSTR_ID
+    """
+        builder._compile(source_code)
+
+    def test_constr_id_access(self):
+        source_code = """
+from dataclasses import dataclass
+from pycardano import Datum as Anything, PlutusData
+from typing import Dict, List, Union
+
+@dataclass
+class A(PlutusData):
+    CONSTR_ID = 15
+    a: int
+    b: bytes
+    d: List[int]
+
+def validator(_: None) -> int:
+    return A(0, b"", [1,2]).CONSTR_ID
+    """
+        res = eval_uplc_value(source_code, Unit())
+
+        self.assertEqual(15, res, "Invalid constr id")
diff --git a/opshin/tests/utils.py b/opshin/tests/utils.py
index 1a7e9415..290b2364 100644
--- a/opshin/tests/utils.py
+++ b/opshin/tests/utils.py
@@ -1,4 +1,5 @@
 import dataclasses
+import functools
 import typing
 
 import pycardano