diff --git a/Modules/dbmmodule.c b/Modules/dbmmodule.c
index cc963a2..8bfbbcd 100644
--- a/Modules/dbmmodule.c
+++ b/Modules/dbmmodule.c
@@ -70,7 +70,7 @@
 	PyObject_Del(dp);
 }
 
-static int
+static Py_ssize_t
 dbm_length(dbmobject *dp)
 {
         if (dp->di_dbm == NULL) {
@@ -162,7 +162,7 @@
 }
 
 static PyMappingMethods dbm_as_mapping = {
-	(inquiry)dbm_length,		/*mp_length*/
+	(lenfunc)dbm_length,		/*mp_length*/
 	(binaryfunc)dbm_subscript,	/*mp_subscript*/
 	(objobjargproc)dbm_ass_sub,	/*mp_ass_subscript*/
 };