diff --git a/src/type/bigint_type.cpp b/src/type/bigint_type.cpp
index 28adde0095..fe79ea7248 100644
--- a/src/type/bigint_type.cpp
+++ b/src/type/bigint_type.cpp
@@ -289,7 +289,7 @@ void BigintType::SerializeTo(const Value& val, SerializeOutput &out) const {
 void BigintType::SerializeTo(const Value& val, char *storage, bool inlined UNUSED_ATTRIBUTE,
     AbstractPool *pool UNUSED_ATTRIBUTE) const {
 
-  *reinterpret_cast<int32_t *>(storage) = val.value_.bigint;
+  *reinterpret_cast<int64_t *>(storage) = val.value_.bigint;
 
 }