diff --git a/include/pocketpy/str.h b/include/pocketpy/str.h
index f03cca05..bb3de83d 100644
--- a/include/pocketpy/str.h
+++ b/include/pocketpy/str.h
@@ -13,7 +13,7 @@ struct Str{
     int size;
     bool is_ascii;
     char* data;
-    char _inlined[24];
+    char _inlined[16];
 
     bool is_inlined() const { return data == _inlined; }