diff --git a/nostrdb/cursor.h b/nostrdb/cursor.h
index 7de80e30..4fb2038f 100644
--- a/nostrdb/cursor.h
+++ b/nostrdb/cursor.h
@@ -595,7 +595,7 @@ 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)