diff --git a/src/ifcopenshell-python/ifcopenshell/entity_instance.py b/src/ifcopenshell-python/ifcopenshell/entity_instance.py
index 62f1a03dab..f624effa1e 100644
--- a/src/ifcopenshell-python/ifcopenshell/entity_instance.py
+++ b/src/ifcopenshell-python/ifcopenshell/entity_instance.py
@@ -27,6 +27,9 @@ import numbers
 import itertools
 import operator
 import functools
+import subprocess
+import sys
+import time
 
 from . import ifcopenshell_wrapper
 from . import settings
diff --git a/src/ifcopenshell-python/ifcopenshell/express/rule_executor.py b/src/ifcopenshell-python/ifcopenshell/express/rule_executor.py
index d7d20f2122..b91597e042 100644
--- a/src/ifcopenshell-python/ifcopenshell/express/rule_executor.py
+++ b/src/ifcopenshell-python/ifcopenshell/express/rule_executor.py
@@ -81,7 +81,7 @@ def run(f, logger):
     orig = ifcopenshell.settings.unpack_non_aggregate_inverses
     ifcopenshell.settings.unpack_non_aggregate_inverses = True
 
-    fn = os.path.join(os.path.dirname(__file__), "rules", f"{f.schema}.py")
+    fn = os.path.join(os.path.dirname(__file__), "rules", f"{f.schema_identifier}.py")
     try:
         source = open(fn, "r").read()
     except FileNotFoundError as e:
@@ -90,7 +90,7 @@ def run(f, logger):
         import subprocess
 
         current_dir_files = {fn.lower(): fn for fn in os.listdir('.')}
-        schema_name = str(f.schema).split(' ')[-1].lower()
+        schema_name = str(f.schema_identifier).split(' ')[-1].lower()
         schema_path = current_dir_files.get(schema_name + '.exp')
         fn = schema_path[:-4] + '.py'
         if not os.path.exists(fn):
@@ -100,7 +100,7 @@ def run(f, logger):
 
     a = ast.parse(source)
     assertion.rewrite.rewrite_asserts(mod=a, source=source)
-    cd = compile(a, f"{f.schema}.py", "exec")
+    cd = compile(a, f"{f.schema_identifier}.py", "exec")
     scope = {}
     exec(cd, scope)
     S = ifcopenshell.ifcopenshell_wrapper.schema_by_name(f.schema_identifier)
diff --git a/src/ifcopenshell-python/ifcopenshell/validate.py b/src/ifcopenshell-python/ifcopenshell/validate.py
index bd1b8cfd66..debe8e9d09 100644
--- a/src/ifcopenshell-python/ifcopenshell/validate.py
+++ b/src/ifcopenshell-python/ifcopenshell/validate.py
@@ -328,7 +328,7 @@ def validate(f, logger, express_rules=False):
 
         log_internal_cpp_errors(filename, logger)
 
-    schema = ifcopenshell.ifcopenshell_wrapper.schema_by_name(f.schema)
+    schema = ifcopenshell.ifcopenshell_wrapper.schema_by_name(f.schema_identifier)
     for inst in f:
         if hasattr(logger, "set_state"):
             logger.set_state('instance', inst)