diff --git a/src/vector.c b/src/vector.c
index 50434f5..42ab42c 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -272,8 +272,8 @@ vector_send(PG_FUNCTION_ARGS)
 	int			i;
 
 	pq_begintypsend(&buf);
-	pq_sendint16(&buf, vec->dim);
-	pq_sendint16(&buf, vec->unused);
+	pq_sendint(&buf, vec->dim, sizeof(int16));
+	pq_sendint(&buf, vec->unused, sizeof(int16));
 	for (i = 0; i < vec->dim; i++)
 		pq_sendfloat4(&buf, vec->x[i]);