diff --git a/test_generator/fuzzers/Echidna.py b/test_generator/fuzzers/Echidna.py
index c8f305e..31987a9 100644
--- a/test_generator/fuzzers/Echidna.py
+++ b/test_generator/fuzzers/Echidna.py
@@ -86,7 +86,7 @@ def _parse_call_object(self, call_dict: dict[Any, Any]) -> tuple[str, str]:
             if entry_point.name == function_name:
                 slither_entry_point = entry_point
 
-        if 'slither_entry_point' not in locals():
+        if "slither_entry_point" not in locals():
             handle_exit(
                 f"\n* Slither could not find the function `{function_name}` specified in the call object"
             )
diff --git a/test_generator/fuzzers/Medusa.py b/test_generator/fuzzers/Medusa.py
index b648ffb..75ee132 100644
--- a/test_generator/fuzzers/Medusa.py
+++ b/test_generator/fuzzers/Medusa.py
@@ -86,7 +86,7 @@ def _parse_call_object(self, call_dict: dict) -> tuple[str, str]:
             if entry_point.name == function_name:
                 slither_entry_point = entry_point
 
-        if 'slither_entry_point' not in locals():
+        if "slither_entry_point" not in locals():
             handle_exit(
                 f"\n* Slither could not find the function `{function_name}` specified in the call object"
             )