diff --git a/libarchive/types/archive.py b/libarchive/types/archive.py
index d48b635..01306e4 100644
--- a/libarchive/types/archive.py
+++ b/libarchive/types/archive.py
@@ -1,5 +1,10 @@
 from ctypes import *
 
+try:
+    from ctypes import c_ssize_t
+except ImportError:
+    from ctypes import c_longlong as c_ssize_t
+
 ARCHIVE_WRITE_CALLBACK = CFUNCTYPE(c_ssize_t, c_void_p, c_void_p, POINTER(c_void_p), c_size_t)
 ARCHIVE_OPEN_CALLBACK = CFUNCTYPE(c_int, c_void_p, c_void_p)
 ARCHIVE_CLOSE_CALLBACK = CFUNCTYPE(c_int, c_void_p, c_void_p)