diff --git a/cursor.h b/cursor.h
index 8b126d0..2be7f19 100644
--- a/cursor.h
+++ b/cursor.h
@@ -568,7 +568,7 @@ static inline int is_punctuation(unsigned int codepoint) {
         return 0;
     
     // Check for ASCII punctuation
-    if (ispunct(codepoint))
+    if (codepoint <= 128 && ispunct(codepoint))
         return 1;
 
     // Check for Unicode punctuation exceptions (punctuation allowed in hashtags)