diff --git a/pythainlp/util/normalize.py b/pythainlp/util/normalize.py
index da1b9bc46..441182d21 100644
--- a/pythainlp/util/normalize.py
+++ b/pythainlp/util/normalize.py
@@ -38,7 +38,7 @@
     f"{follow_v}{lead_v}{above_v}{below_v}\u0e3a\u0e4c\u0e4d\u0e4e"
 )
 _NOREPEAT_PAIRS = list(
-    zip([f"({ch}[ ]*)+" for ch in _NOREPEAT_CHARS], _NOREPEAT_CHARS)
+    zip([f"({ch}[ ]*)+{ch}" for ch in _NOREPEAT_CHARS], _NOREPEAT_CHARS)
 )
 
 _RE_TONEMARKS = re.compile(f"[{tonemarks}]+")