diff --git a/Python/mactoolboxglue.c b/Python/mactoolboxglue.c
index 0714cff..454553e 100644
--- a/Python/mactoolboxglue.c
+++ b/Python/mactoolboxglue.c
@@ -194,7 +194,7 @@
 PyMac_BuildOSType(OSType t)
 {
 	uint32_t tmp = htonl((uint32_t)t);
-	return PyBytes_FromStringAndSize((char *)&tmp, 4);
+	return PyString_FromStringAndSize((char *)&tmp, 4);
 }
 
 /* Convert an NumVersion value to a 4-element tuple */