diff --git a/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim b/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
index 45b5e372b..96da33953 100644
--- a/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
+++ b/beacon_chain/spec/eth2_apis/eth2_rest_serialization.nim
@@ -3536,7 +3536,9 @@ proc decodeBody*(
     of ConsensusFork.Phase0:
       let blck =
         try:
-          SSZ.decode(body.data, phase0.SignedBeaconBlock)
+          var res = SSZ.decode(body.data, phase0.SignedBeaconBlock)
+          res.root = hash_tree_root(res.message)
+          res
         except SerializationError as exc:
           return err(RestErrorMessage.init(Http400, UnableDecodeError,
                                            [version, exc.formatMsg("<data>")]))
@@ -3548,7 +3550,9 @@ proc decodeBody*(
     of ConsensusFork.Altair:
       let blck =
         try:
-          SSZ.decode(body.data, altair.SignedBeaconBlock)
+          var res = SSZ.decode(body.data, altair.SignedBeaconBlock)
+          res.root = hash_tree_root(res.message)
+          res
         except SerializationError as exc:
           return err(RestErrorMessage.init(Http400, UnableDecodeError,
                                            [version, exc.formatMsg("<data>")]))
@@ -3560,7 +3564,9 @@ proc decodeBody*(
     of ConsensusFork.Bellatrix:
       let blck =
         try:
-          SSZ.decode(body.data, bellatrix.SignedBeaconBlock)
+          var res = SSZ.decode(body.data, bellatrix.SignedBeaconBlock)
+          res.root = hash_tree_root(res.message)
+          res
         except SerializationError as exc:
           return err(RestErrorMessage.init(Http400, UnableDecodeError,
                                            [version, exc.formatMsg("<data>")]))
@@ -3572,7 +3578,9 @@ proc decodeBody*(
     of ConsensusFork.Capella:
       let blck =
         try:
-          SSZ.decode(body.data, capella.SignedBeaconBlock)
+          var res = SSZ.decode(body.data, capella.SignedBeaconBlock)
+          res.root = hash_tree_root(res.message)
+          res
         except SerializationError as exc:
           return err(RestErrorMessage.init(Http400, UnableDecodeError,
                                            [version, exc.formatMsg("<data>")]))
@@ -3584,7 +3592,9 @@ proc decodeBody*(
     of ConsensusFork.Deneb:
       let blckContents =
         try:
-          SSZ.decode(body.data, DenebSignedBlockContents)
+          var res = SSZ.decode(body.data, DenebSignedBlockContents)
+          res.signed_block.root = hash_tree_root(res.signed_block.message)
+          res
         except SerializationError as exc:
           return err(RestErrorMessage.init(Http400, UnableDecodeError,
                                            [version, exc.formatMsg("<data>")]))
@@ -3596,7 +3606,9 @@ proc decodeBody*(
     of ConsensusFork.Electra:
       let blckContents =
         try:
-          SSZ.decode(body.data, ElectraSignedBlockContents)
+          var res = SSZ.decode(body.data, ElectraSignedBlockContents)
+          res.signed_block.root = hash_tree_root(res.signed_block.message)
+          res
         except SerializationError as exc:
           return err(RestErrorMessage.init(Http400, UnableDecodeError,
                                            [version, exc.formatMsg("<data>")]))