diff --git a/test/packed_buffer_test.cpp b/test/packed_buffer_test.cpp
index d3551f2..065bd74 100644
--- a/test/packed_buffer_test.cpp
+++ b/test/packed_buffer_test.cpp
@@ -26,7 +26,11 @@ struct X
 
 int main()
 {
-    BOOST_TEST_EQ( sizeof( X ), 12 );
+    BOOST_TEST_EQ( sizeof(big_uint16_buf_t), 2 );
+    BOOST_TEST_EQ( sizeof(double), 8 );
+    BOOST_TEST_EQ( sizeof(little_uint16_buf_t), 2 );
+    BOOST_TEST_EQ( sizeof(X), 12 );
+
     return boost::report_errors();
 }