--- a/Pyrex/Compiler/TypeSlots.py	2007-10-05 10:18:32.000000000 +0100
+++ b/Pyrex/Compiler/TypeSlots.py	2007-11-16 20:11:26.000000000 +0000
@@ -27,6 +27,7 @@
     #    'I'  int *
     #    'l'  long
     #    'Z'  Py_ssize_t
+    #    'Z1'  Py_ssize_t But '-1' is the error code
     #    's'  char *
     #    'S'  char **
     #    'r'  int used only to signal exception
@@ -44,6 +45,7 @@
         'I': PyrexTypes.c_int_ptr_type,
         'l': PyrexTypes.c_long_type,
         'Z': PyrexTypes.c_py_ssize_t_type,
+        'Z1': PyrexTypes.c_py_ssize_t_type,
         's': PyrexTypes.c_char_ptr_type,
         'S': PyrexTypes.c_char_ptr_ptr_type,
         'r': PyrexTypes.c_returncode_type,
@@ -56,6 +58,7 @@
         'i': "-1",
         'l': "-1",
         'r': "-1",
+        'Z1': "-1",
     }
     
     def __init__(self, arg_format, ret_format):
@@ -376,7 +379,7 @@
 iternaryfunc = Signature("TOO", "O")       # typedef PyObject * (*ternaryfunc)(PyObject *, PyObject *, PyObject *);
 callfunc = Signature("T*", "O")            # typedef PyObject * (*ternaryfunc)(PyObject *, PyObject *, PyObject *);
 inquiry = Signature("T", "i")              # typedef int (*inquiry)(PyObject *);
-lenfunc = Signature("T", "Z")              # typedef Py_ssize_t (*lenfunc)(PyObject *);
+lenfunc = Signature("T", "Z1")              # typedef Py_ssize_t (*lenfunc)(PyObject *);
                                            # typedef int (*coercion)(PyObject **, PyObject **);
 intargfunc = Signature("Ti", "O")          # typedef PyObject *(*intargfunc)(PyObject *, int);
 ssizeargfunc = Signature("TZ", "O")        # typedef PyObject *(*ssizeargfunc)(PyObject *, Py_ssize_t);