diff --git a/CHANGES.rst b/CHANGES.rst
index 93f93de0d176f678f60de92288a847a5ed777ef7..dab05209e73fa7934696665ed8eec5010b1a70d4 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -186,9 +186,11 @@ DAL node
 - Fixed file descriptor leak in resto affecting connections to the L1 node.
   (MR :gl:`!15322`)
 
-
 - **Breaking change** The baker daemon ``--dal-node-timeout-percentage``
   argument has been removed. (MR :gl:`!15554`)
 
+- Set the message validation function at node startup, fixing
+  https://gitlab.com/tezos/tezos/-/issues/7629. (MR :gl:`!15830`)
+
 Miscellaneous
 -------------
diff --git a/src/bin_dal_node/daemon.ml b/src/bin_dal_node/daemon.ml
index 3fcf4f5b7b4be2b9a3e3c066f8bef2ca8ea54f55..684a3e905c6350c1e5ae5959f380126d188ee843 100644
--- a/src/bin_dal_node/daemon.ml
+++ b/src/bin_dal_node/daemon.ml
@@ -1315,6 +1315,12 @@ let run ~data_dir ~configuration_override =
       transport_layer
       cctxt
   in
+  Gossipsub.Worker.Validate_message_hook.set
+    (Handler.gossipsub_app_messages_validation
+       ctxt
+       cryptobox
+       head_level
+       proto_parameters) ;
   let is_prover_profile = Profile_manager.is_prover_profile profile_ctxt in
   (* Initialize amplificator if in prover profile.
      This forks a process and should be kept early to avoid copying opened file
diff --git a/src/lib_dal_node/gossipsub/gs_interface.ml b/src/lib_dal_node/gossipsub/gs_interface.ml
index 0e8c41317cfbc04b20221288b0d0aa1d8c310fc0..b150dd904bba5a8ef3b67d317f2818bf79cb06c6 100644
--- a/src/lib_dal_node/gossipsub/gs_interface.ml
+++ b/src/lib_dal_node/gossipsub/gs_interface.ml
@@ -28,13 +28,21 @@ open Gossipsub_intf
 module Types = Tezos_dal_node_services.Types
 
 module Validate_message_hook = struct
-  (* FIXME: https://gitlab.com/tezos/tezos/-/issues/5674
+  let warn_validation_function_not_set =
+    Internal_event.Simple.declare_0
+      ~section:["dal"; "gs_interface"]
+      ~name:"message_validation_function_not_set"
+      ~msg:"The message validation function is not set"
+      ~level:Warning
 
+  (* FIXME: https://gitlab.com/tezos/tezos/-/issues/5674
      Refactor gossipsub integration to avoid this mutable hook in the lib. *)
   let check_message =
     ref (fun ?message:_ ~message_id:_ () ->
-        Format.eprintf
-          "Gs interface: messages validatation function is not set@." ;
+        Internal_event.Simple.(
+          emit__dont_wait__use_with_care
+            (warn_validation_function_not_set ())
+            ()) ;
         `Unknown)
 
   let set func = check_message := func