diff --git a/mythril/laser/ethereum/call.py b/mythril/laser/ethereum/call.py
index 55066aac..c9d95854 100644
--- a/mythril/laser/ethereum/call.py
+++ b/mythril/laser/ethereum/call.py
@@ -124,7 +124,7 @@ def get_callee_account(global_state, callee_address, dynamic_loader):
         code = dynamic_loader.dynld(environment.active_account.address, callee_address)
     except ValueError as error:
         logging.debug("Unable to execute dynamic loader because: {}".format(str(error)))
-        raise ValueError(str(error))
+        raise error
     if code is None:
         logging.debug("No code returned, not a contract account?")
         raise ValueError()
diff --git a/mythril/laser/ethereum/state.py b/mythril/laser/ethereum/state.py
index a2dcf8ae..7f8bcb1f 100644
--- a/mythril/laser/ethereum/state.py
+++ b/mythril/laser/ethereum/state.py
@@ -100,9 +100,7 @@ class Calldata:
                 if stop is None:
                     stop = self.calldatasize
                 current_index = (
-                    start
-                    if isinstance(start, BitVecRef)
-                    else BitVecVal(start, 256)
+                    start if isinstance(start, BitVecRef) else BitVecVal(start, 256)
                 )
                 dataparts = []
                 while simplify(current_index != stop):
diff --git a/mythril/laser/ethereum/util.py b/mythril/laser/ethereum/util.py
index 8143d164..84df4027 100644
--- a/mythril/laser/ethereum/util.py
+++ b/mythril/laser/ethereum/util.py
@@ -89,8 +89,10 @@ def get_concrete_int(item):
 
 
 def concrete_int_from_bytes(_bytes, start_index):
-    _bytes = [_byte.as_long() if type(_byte) == BitVecNumRef else _byte for _byte in _bytes]
-    b = _bytes[start_index: start_index + 32]
+    _bytes = [
+        _byte.as_long() if type(_byte) == BitVecNumRef else _byte for _byte in _bytes
+    ]
+    b = _bytes[start_index : start_index + 32]
     val = int.from_bytes(b, byteorder="big")
 
     return val