diff --git a/pythainlp/tokenize/longest.py b/pythainlp/tokenize/longest.py
index 1b0bf7184..053f9735c 100644
--- a/pythainlp/tokenize/longest.py
+++ b/pythainlp/tokenize/longest.py
@@ -38,7 +38,6 @@
 _TRAILING_CHAR = ["ๆ", "ฯ"]
 
 _RE_NONTHAI = re.compile(r"[A-Za-z\d]*")
-_RE_SPACES = re.compile(r"\s+")
 
 _KNOWN = True
 _UNKNOWN = False