diff --git a/massa-deferred-calls/src/registry_changes.rs b/massa-deferred-calls/src/registry_changes.rs
index c6475df304..1895e0c042 100644
--- a/massa-deferred-calls/src/registry_changes.rs
+++ b/massa-deferred-calls/src/registry_changes.rs
@@ -1,5 +1,3 @@
-use std::{collections::BTreeMap, ops::Bound};
-
 use massa_models::{
     amount::Amount,
     deferred_calls::DeferredCallId,
@@ -18,6 +16,8 @@ use nom::{
 };
 use serde::{Deserialize, Serialize};
 use serde_with::serde_as;
+use std::collections::btree_map::Entry;
+use std::{collections::BTreeMap, ops::Bound};
 
 use crate::{
     config::DeferredCallsConfig,
@@ -50,6 +50,24 @@ impl Default for DeferredCallRegistryChanges {
 }
 
 impl DeferredCallRegistryChanges {
+    pub fn apply(&mut self, changes: DeferredCallRegistryChanges) {
+        for (slot, changes) in changes.slots_change.into_iter() {
+            match self.slots_change.entry(slot) {
+                Entry::Occupied(mut occ) => {
+                    // apply incoming change if a change on this entry already exists
+                    *occ.get_mut() = changes;
+                }
+                Entry::Vacant(vac) => {
+                    // otherwise insert the incoming change
+                    vac.insert(changes);
+                }
+            }
+        }
+
+        self.effective_total_gas = changes.effective_total_gas;
+        self.total_calls_registered = changes.total_calls_registered;
+    }
+
     pub fn delete_call(&mut self, target_slot: Slot, id: &DeferredCallId) {
         self.slots_change
             .entry(target_slot)
diff --git a/massa-execution-worker/src/active_history.rs b/massa-execution-worker/src/active_history.rs
index 08aeeb923a..3841a98dd1 100644
--- a/massa-execution-worker/src/active_history.rs
+++ b/massa-execution-worker/src/active_history.rs
@@ -444,7 +444,6 @@ mod test {
             executed_ops_changes: Default::default(),
             executed_denunciations_changes: Default::default(),
             execution_trail_hash_change: Default::default(),
-            deferred_call_changes: Default::default(),
         };
         let state_changes_2 = StateChanges {
             ledger_changes: Default::default(),
@@ -454,7 +453,6 @@ mod test {
             executed_ops_changes: Default::default(),
             executed_denunciations_changes: Default::default(),
             execution_trail_hash_change: Default::default(),
-            deferred_call_changes: Default::default(),
         };
 
         let exec_output_1 = ExecutionOutput {
diff --git a/massa-final-state/src/state_changes.rs b/massa-final-state/src/state_changes.rs
index ce1b02746a..eb7e47a14d 100644
--- a/massa-final-state/src/state_changes.rs
+++ b/massa-final-state/src/state_changes.rs
@@ -233,7 +233,6 @@ impl Deserializer<StateChanges> for StateChangesDeserializer {
 impl StateChanges {
     /// extends the current `StateChanges` with another one
     pub fn apply(&mut self, changes: StateChanges) {
-        // TODO deferred_call_changes ?
         use massa_models::types::Applicable;
         self.ledger_changes.apply(changes.ledger_changes);
         self.async_pool_changes.apply(changes.async_pool_changes);
@@ -244,6 +243,8 @@ impl StateChanges {
             .extend(changes.executed_denunciations_changes);
         self.execution_trail_hash_change
             .apply(changes.execution_trail_hash_change);
+        self.deferred_call_changes
+            .apply(changes.deferred_call_changes);
     }
 }
 
@@ -274,16 +275,16 @@ mod test {
 
     impl PartialEq<StateChanges> for StateChanges {
         fn eq(&self, other: &StateChanges) -> bool {
-            self.ledger_changes == other.ledger_changes &&
-                self.async_pool_changes == other.async_pool_changes &&
-                // pos_changes
-                self.pos_changes.seed_bits == other.pos_changes.seed_bits &&
-                self.pos_changes.roll_changes == other.pos_changes.roll_changes &&
-                self.pos_changes.production_stats == other.pos_changes.production_stats &&
-                self.pos_changes.deferred_credits.credits == other.pos_changes.deferred_credits.credits &&
-                self.executed_ops_changes == other.executed_ops_changes &&
-                self.executed_denunciations_changes == other.executed_denunciations_changes &&
-                self.execution_trail_hash_change == other.execution_trail_hash_change
+            self.ledger_changes == other.ledger_changes
+                && self.async_pool_changes == other.async_pool_changes
+                && self.pos_changes.seed_bits == other.pos_changes.seed_bits
+                && self.pos_changes.roll_changes == other.pos_changes.roll_changes
+                && self.pos_changes.production_stats == other.pos_changes.production_stats
+                && self.pos_changes.deferred_credits.credits
+                    == other.pos_changes.deferred_credits.credits
+                && self.executed_ops_changes == other.executed_ops_changes
+                && self.executed_denunciations_changes == other.executed_denunciations_changes
+                && self.execution_trail_hash_change == other.execution_trail_hash_change
         }
     }