diff --git a/erb/cpp03_zone.hpp.erb b/erb/cpp03_zone.hpp.erb
index f8f96cf1..4b55eedf 100644
--- a/erb/cpp03_zone.hpp.erb
+++ b/erb/cpp03_zone.hpp.erb
@@ -29,7 +29,7 @@
 #endif
 
 #ifndef MSGPACK_ZONE_ALIGN
-#define MSGPACK_ZONE_ALIGN sizeof(int)
+#define MSGPACK_ZONE_ALIGN sizeof(void*)
 #endif
 
 <% GENERATION_LIMIT = 15 %>
diff --git a/include/msgpack/detail/cpp03_zone.hpp b/include/msgpack/detail/cpp03_zone.hpp
index 880544c1..45306b6f 100644
--- a/include/msgpack/detail/cpp03_zone.hpp
+++ b/include/msgpack/detail/cpp03_zone.hpp
@@ -29,7 +29,7 @@
 #endif
 
 #ifndef MSGPACK_ZONE_ALIGN
-#define MSGPACK_ZONE_ALIGN sizeof(int)
+#define MSGPACK_ZONE_ALIGN sizeof(void*)
 #endif
 
 
diff --git a/include/msgpack/detail/cpp11_zone.hpp b/include/msgpack/detail/cpp11_zone.hpp
index e18a6cdc..632dd10a 100644
--- a/include/msgpack/detail/cpp11_zone.hpp
+++ b/include/msgpack/detail/cpp11_zone.hpp
@@ -31,7 +31,7 @@
 #endif
 
 #ifndef MSGPACK_ZONE_ALIGN
-#define MSGPACK_ZONE_ALIGN sizeof(int)
+#define MSGPACK_ZONE_ALIGN sizeof(void*)
 #endif
 
 namespace msgpack {
diff --git a/include/msgpack/zone.h b/include/msgpack/zone.h
index 572185ce..62ea2bf5 100644
--- a/include/msgpack/zone.h
+++ b/include/msgpack/zone.h
@@ -89,7 +89,7 @@ void msgpack_zone_clear(msgpack_zone* zone);
 
 
 #ifndef MSGPACK_ZONE_ALIGN
-#define MSGPACK_ZONE_ALIGN sizeof(int)
+#define MSGPACK_ZONE_ALIGN sizeof(void*)
 #endif
 
 MSGPACK_DLLEXPORT