diff --git a/src/punctuation/sentence.py b/src/punctuation/sentence.py
index 6a5c501..603b26a 100755
--- a/src/punctuation/sentence.py
+++ b/src/punctuation/sentence.py
@@ -17,6 +17,7 @@ punctuations = [
 duplicates = [
     '~', '！', '？',
     delimiter + '，',
+    delimiter + '。',
     delimiter + '！',
     delimiter + '？',
     delimiter + '、',