diff --git a/src/rpcclient/rpcclient/darwin/structs.py b/src/rpcclient/rpcclient/darwin/structs.py
index 8ac61d87..78d5b9af 100644
--- a/src/rpcclient/rpcclient/darwin/structs.py
+++ b/src/rpcclient/rpcclient/darwin/structs.py
@@ -485,7 +485,8 @@ def _encode(self, obj, context, path):
 
 # we can't use sockaddr_un since the sun_path may contain utf8 invalid characters
 sockaddr_un_raw = Struct(
-    'sun_family' / Default(Int16sl, AF_UNIX),
+    'sun_len' / Int8ul,
+    'sun_family' / Default(Int8ul, AF_UNIX),
     '_sun_path' / Bytes(UNIX_PATH_MAX),
     'sun_path' / Computed(lambda x: x._sun_path.split(b'\x00', 1)[0].decode())
 )
diff --git a/src/rpcclient/rpcclient/structs/generic.py b/src/rpcclient/rpcclient/structs/generic.py
index c8b9319b..7e1c75d4 100644
--- a/src/rpcclient/rpcclient/structs/generic.py
+++ b/src/rpcclient/rpcclient/structs/generic.py
@@ -3,7 +3,7 @@
 
 from rpcclient.structs.consts import AF_INET, AF_INET6, AF_UNIX
 
-UNIX_PATH_MAX = 108
+UNIX_PATH_MAX = 104
 
 u_char = Int8ul
 uint8_t = Int8ul
@@ -36,7 +36,8 @@
 )
 
 sockaddr_un = Struct(
-    'sun_family' / Default(Int16sl, AF_UNIX),
+    'sun_len' / Default(Int8ul, 0),
+    'sun_family' / Default(Int8ul, AF_UNIX),
     'sun_path' / PaddedString(UNIX_PATH_MAX, 'utf8'),
 )