Renamed PyString to PyBytes
diff --git a/Modules/_dbmmodule.c b/Modules/_dbmmodule.c
index 8484d94..ddfd4cd 100644
--- a/Modules/_dbmmodule.c
+++ b/Modules/_dbmmodule.c
@@ -219,14 +219,14 @@
 		if (arg == NULL)
 			return -1;
 	}
-	if (!PyString_Check(arg)) {
+	if (!PyBytes_Check(arg)) {
 		PyErr_Format(PyExc_TypeError,
 			     "dbm key must be string, not %.100s",
 			     arg->ob_type->tp_name);
 		return -1;
 	}
-	key.dptr = PyString_AS_STRING(arg);
-	key.dsize = PyString_GET_SIZE(arg);
+	key.dptr = PyBytes_AS_STRING(arg);
+	key.dsize = PyBytes_GET_SIZE(arg);
 	val = dbm_fetch(dp->di_dbm, key);
 	return val.dptr != NULL;
 }