diff --git a/include/jsoncons/bigint.hpp b/include/jsoncons/bigint.hpp
index db8618848d..25254bdc0a 100644
--- a/include/jsoncons/bigint.hpp
+++ b/include/jsoncons/bigint.hpp
@@ -511,7 +511,7 @@ class basic_bigint : protected detail::basic_bigint_base<Allocator>
         common_stor_.length_ = n;
 
         uint64_t* a = data();
-        for (size_type i = len_old; i < common_stor_.length_; ++i)
+        for (size_type i = len_old; i < n; ++i)
         {
             a[i] = 0;
         }