diff --git a/zscan.go b/zscan.go
index 307e5500..29e1095a 100644
--- a/zscan.go
+++ b/zscan.go
@@ -14,7 +14,7 @@ var _DEBUG = false
 
 // Complete unsure about the correctness of this value?
 // Large blobs of base64 code might get longer than this....
-const maxTok = 300
+const maxTok = 512
 
 // Tokinize a RFC 1035 zone file. The tokenizer will normalize it:
 // * Add ownernames if they are left blank;