diff --git a/src/lib_shell/state.ml b/src/lib_shell/state.ml
index 05bfbbaff..a8cce1501 100644
--- a/src/lib_shell/state.ml
+++ b/src/lib_shell/state.ml
@@ -221,8 +221,9 @@ module Locked_block = struct
     let header : Block_header.t = { shell ; protocol_data = MBytes.create 0 } in
     Store.Block.Contents.store (store, genesis.block)
       { Store.Block.header ; message = Some "Genesis" ;
-        max_operations_ttl = 0 ;
-        context ; metadata = MBytes.create 0 ;
+        max_operations_ttl = 0 ; context ;
+        metadata = MBytes.create 0 ;
+        last_allowed_fork_level = 0l ;
       } >>= fun () ->
     Lwt.return header
 
@@ -442,6 +443,8 @@ module Block = struct
   let message { contents = { message } } = message
   let max_operations_ttl { contents = { max_operations_ttl } } =
     max_operations_ttl
+  let last_allowed_fork_level { contents = { last_allowed_fork_level } } =
+    last_allowed_fork_level
 
   let is_genesis b = Block_hash.equal b.hash b.chain_state.genesis.block
 
@@ -540,7 +543,7 @@ module Block = struct
       chain_state block_header block_header_metadata
       operations operations_metadata
       { Tezos_protocol_environment_shell.context ; message ;
-        max_operations_ttl } =
+        max_operations_ttl ; last_allowed_fork_level } =
     let bytes = Block_header.to_bytes block_header in
     let hash = Block_header.hash_raw bytes in
     fail_unless
@@ -577,6 +580,7 @@ module Block = struct
               block_header ;
           message ;
           max_operations_ttl ;
+          last_allowed_fork_level ;
           context = commit ;
           metadata = block_header_metadata ;
         } in
diff --git a/src/lib_shell/state.mli b/src/lib_shell/state.mli
index ae115dde0..ec29e3541 100644
--- a/src/lib_shell/state.mli
+++ b/src/lib_shell/state.mli
@@ -120,6 +120,7 @@ module Block : sig
   val message: t -> string option
   val max_operations_ttl: t -> int
   val metadata: t -> MBytes.t
+  val last_allowed_fork_level: t -> Int32.t
 
   val is_genesis: t -> bool
   val predecessor: t -> block option Lwt.t
diff --git a/src/lib_shell/store.ml b/src/lib_shell/store.ml
index 692922cf7..889001e00 100644
--- a/src/lib_shell/store.ml
+++ b/src/lib_shell/store.ml
@@ -84,6 +84,7 @@ module Block = struct
     header: Block_header.t ;
     message: string option ;
     max_operations_ttl: int ;
+    last_allowed_fork_level: Int32.t ;
     context: Context_hash.t ;
     metadata: MBytes.t ;
   }
@@ -98,16 +99,19 @@ module Block = struct
            let open Data_encoding in
            conv
              (fun { header ; message ; max_operations_ttl ;
+                    last_allowed_fork_level ;
                     context ; metadata } ->
-               (message, max_operations_ttl,
+               (message, max_operations_ttl, last_allowed_fork_level,
                 context, metadata, header ))
-             (fun (message, max_operations_ttl,
+             (fun (message, max_operations_ttl, last_allowed_fork_level,
                    context, metadata, header ) ->
                { header ; message ; max_operations_ttl ;
+                 last_allowed_fork_level ;
                  context ; metadata })
-             (obj5
+             (obj6
                 (opt "message" string)
                 (req "max_operations_ttl" uint16)
+                (req "last_allowed_fork_level" int32)
                 (req "context" Context_hash.encoding)
                 (req "metadata" bytes)
                 (req "header" Block_header.encoding))
diff --git a/src/lib_shell/store.mli b/src/lib_shell/store.mli
index fbd6a3a29..4c20999e3 100644
--- a/src/lib_shell/store.mli
+++ b/src/lib_shell/store.mli
@@ -89,6 +89,7 @@ module Block : sig
     header: Block_header.t ;
     message: string option ;
     max_operations_ttl: int ;
+    last_allowed_fork_level: Int32.t ;
     context: Context_hash.t ;
     metadata: MBytes.t ;
   }
diff --git a/src/lib_shell/test/test_store.ml b/src/lib_shell/test/test_store.ml
index 65f9f826b..f645927e9 100644
--- a/src/lib_shell/test/test_store.ml
+++ b/src/lib_shell/test/test_store.ml
@@ -93,6 +93,8 @@ let lolblock ?(operations = []) header =
     max_operations_ttl = 0 ;
     message = None ;
     context = Context_hash.zero ;
+    max_operation_data_length = 0 ;
+    last_allowed_fork_level = 0l ;
   }
 
 let b1 = lolblock "Blop !"