diff --git a/pythainlp/transliterate/royin.py b/pythainlp/transliterate/royin.py
index d6f6f71c8..58560d5cf 100644
--- a/pythainlp/transliterate/royin.py
+++ b/pythainlp/transliterate/royin.py
@@ -18,6 +18,7 @@
 *าย,\\1ai
 ไ*ย,\\1ai
 *ัย,\\1ai
+ไ**,\\1\\2ai
 ไ*,\\1ai
 ใ*,\\1ai
 *ว*,\\1ua\\2
@@ -177,4 +178,4 @@ def romanize(word: str) -> str:
 
     word2 = _replace_consonants(word2, res)
     
-    return word2
\ No newline at end of file
+    return word2