diff --git a/scapy/contrib/pnio_rpc.py b/scapy/contrib/pnio_rpc.py
index 1a5c97688de..cd9b4de4ad4 100644
--- a/scapy/contrib/pnio_rpc.py
+++ b/scapy/contrib/pnio_rpc.py
@@ -1449,7 +1449,7 @@ def _guess_block_class(_pkt, *args, **kargs):
     return cls(_pkt, *args, **kargs)
 
 
-def dce_rpc_endianess(pkt):
+def dce_rpc_endianness(pkt):
     """determine the symbol for the endianness of a the DCE/RPC"""
     try:
         endianness = pkt.underlayer.endian
@@ -1471,16 +1471,16 @@ class NDRData(Packet):
     fields_desc = [
         EField(
             FieldLenField("args_length", None, fmt="I", length_of="blocks"),
-            endianness_from=dce_rpc_endianess),
+            endianness_from=dce_rpc_endianness),
         EField(
             FieldLenField("max_count", None, fmt="I", length_of="blocks"),
-            endianness_from=dce_rpc_endianess),
+            endianness_from=dce_rpc_endianness),
         EField(
             IntField("offset", 0),
-            endianness_from=dce_rpc_endianess),
+            endianness_from=dce_rpc_endianness),
         EField(
             FieldLenField("actual_count", None, fmt="I", length_of="blocks"),
-            endianness_from=dce_rpc_endianess),
+            endianness_from=dce_rpc_endianness),
         PacketListField("blocks", [], _guess_block_class,
                         length_from=lambda p: p.args_length)
     ]
@@ -1494,7 +1494,7 @@ class PNIOServiceReqPDU(Packet):
     fields_desc = [
         EField(
             FieldLenField("args_max", None, fmt="I", length_of="blocks"),
-            endianness_from=dce_rpc_endianess),
+            endianness_from=dce_rpc_endianness),
         NDRData,
     ]
     overload_fields = {
@@ -1525,7 +1525,7 @@ class PNIOServiceResPDU(Packet):
     """PNIO PDU for RPC Response"""
     fields_desc = [
         EField(IntEnumField("status", 0, ["OK"]),
-               endianness_from=dce_rpc_endianess),
+               endianness_from=dce_rpc_endianness),
         NDRData,
     ]
     overload_fields = {
diff --git a/scapy/contrib/rtps/common_types.py b/scapy/contrib/rtps/common_types.py
index 70bc8cc5770..38913eff0b8 100644
--- a/scapy/contrib/rtps/common_types.py
+++ b/scapy/contrib/rtps/common_types.py
@@ -36,7 +36,7 @@
 FORMAT_LE = "<"
 FORMAT_BE = ">"
 STR_MAX_LEN = 8192
-DEFAULT_ENDIANESS = FORMAT_LE
+DEFAULT_ENDIANNESS = FORMAT_LE
 
 
 def is_le(pkt):
diff --git a/scapy/layers/dcerpc.py b/scapy/layers/dcerpc.py
index 8878a3ed420..edafae91585 100644
--- a/scapy/layers/dcerpc.py
+++ b/scapy/layers/dcerpc.py
@@ -182,7 +182,7 @@ class DCERPC_Transport(IntEnum):
     # TODO: add more.. if people use them?
 
 
-def _dce_rpc_endianess(pkt):
+def _dce_rpc_endianness(pkt):
     """
     Determine the right endianness sign for a given DCE/RPC packet
     """
@@ -196,7 +196,7 @@ def _dce_rpc_endianess(pkt):
 
 class _EField(EField):
     def __init__(self, fld):
-        super(_EField, self).__init__(fld, endianness_from=_dce_rpc_endianess)
+        super(_EField, self).__init__(fld, endianness_from=_dce_rpc_endianness)
 
 
 class DceRpc(Packet):
@@ -222,7 +222,7 @@ class _DceRpcPayload(Packet):
     def endianness(self):
         if not self.underlayer:
             return "!"
-        return _dce_rpc_endianess(self.underlayer)
+        return _dce_rpc_endianness(self.underlayer)
 
 
 # sect 12.5
@@ -947,7 +947,7 @@ class DceRpc5Context(EPacket):
             None,
             DceRpc5TransferSyntax,
             count_from=lambda pkt: pkt.n_transfer_syn,
-            endianness_from=_dce_rpc_endianess,
+            endianness_from=_dce_rpc_endianness,
         ),
     ]
 
@@ -997,7 +997,7 @@ class DceRpc5Bind(_DceRpcPayload):
             "context_elem",
             [],
             DceRpc5Context,
-            endianness_from=_dce_rpc_endianess,
+            endianness_from=_dce_rpc_endianness,
             count_from=lambda pkt: pkt.n_context_elem,
         ),
     ]
@@ -1025,7 +1025,7 @@ class DceRpc5BindAck(_DceRpcPayload):
             "results",
             [],
             DceRpc5Result,
-            endianness_from=_dce_rpc_endianess,
+            endianness_from=_dce_rpc_endianness,
             count_from=lambda pkt: pkt.n_results,
         ),
     ]
@@ -1057,7 +1057,7 @@ class DceRpc5BindNak(_DceRpcPayload):
             [],
             DceRpc5Version,
             count_from=lambda pkt: pkt.n_protocols,
-            endianness_from=_dce_rpc_endianess,
+            endianness_from=_dce_rpc_endianness,
         ),
         # [MS-RPCE] sect 2.2.2.9
         ConditionalField(