1 files changed, 2 insertions, 0 deletions
diff --git a/odb/forward.hxx b/odb/forward.hxx
index 3dd5ef8..a09f08d 100644
--- a/odb/forward.hxx
+++ b/odb/forward.hxx
@@ -27,6 +27,7 @@ namespace odb
 
   //
   //
+  typedef unsigned long long schema_version;
   class database;
   class connection;
   typedef details::shared_ptr<connection> connection_ptr;
@@ -36,6 +37,7 @@ namespace odb
 
   namespace common
   {
+    using odb::schema_version;
     using odb::session;
   }