diff --git a/bluecellulab/circuit/circuit_access/bluepy_circuit_access.py b/bluecellulab/circuit/circuit_access/bluepy_circuit_access.py
index c91d2917..5fe99172 100644
--- a/bluecellulab/circuit/circuit_access/bluepy_circuit_access.py
+++ b/bluecellulab/circuit/circuit_access/bluepy_circuit_access.py
@@ -24,8 +24,6 @@
     import bluepy
     from bluepy.enums import Cell as BluepyCell
     from bluepy.impl.connectome_sonata import SonataConnectome
-else:
-    BlueConfig = type("BlueConfig", (), {})
 
 logger = logging.getLogger(__name__)
 
@@ -33,8 +31,8 @@
 class BluepyCircuitAccess:
     """Bluepy implementation of CircuitAccess protocol."""
 
-    def __init__(self, simulation_config: str | Path | BlueConfig | BluepySimulationConfig) -> None:
-        """Initialize bluepy circuit object."""
+    def __init__(self, simulation_config: str | Path | BluepySimulationConfig) -> None:
+        """Initialize bluepy circuit object. BlueConfig also is a valid type."""
         if not BLUEPY_AVAILABLE:
             raise ExtraDependencyMissingError("bluepy")
         if isinstance(simulation_config, Path):
diff --git a/bluecellulab/circuit/config/bluepy_simulation_config.py b/bluecellulab/circuit/config/bluepy_simulation_config.py
index de16880a..a5b0bf2f 100644
--- a/bluecellulab/circuit/config/bluepy_simulation_config.py
+++ b/bluecellulab/circuit/config/bluepy_simulation_config.py
@@ -9,8 +9,6 @@
 if BLUEPY_AVAILABLE:
     from bluepy_configfile.configfile import BlueConfig
     from bluepy.utils import open_utf8
-else:
-    BlueConfig = type("BlueConfig", (), {})
 
 from bluecellulab.circuit.config.sections import Conditions, ConnectionOverrides
 from bluecellulab.stimuli import Stimulus
@@ -20,7 +18,8 @@ class BluepySimulationConfig:
     """Bluepy implementation of SimulationConfig protocol."""
     _connection_overrides: list[ConnectionOverrides] = []
 
-    def __init__(self, config: str | BlueConfig) -> None:
+    def __init__(self, config: str) -> None:
+        """a str or a BlueConfig object are valid."""
         if not BLUEPY_AVAILABLE:
             raise ExtraDependencyMissingError("bluepy")
         if isinstance(config, str):