diff --git a/actors/market/src/lib.rs b/actors/market/src/lib.rs
index b8b51c956..717ed5cd8 100644
--- a/actors/market/src/lib.rs
+++ b/actors/market/src/lib.rs
@@ -976,13 +976,22 @@ impl Actor {
         let st = rt.state::<State>()?;
         let found = st.find_deal_state(rt.store(), params.id)?;
         match found {
-            Some(state) => Ok(GetDealActivationReturn {
-                // If we have state, the deal has been activated.
-                // It may also have completed normally, or been terminated,
-                // but not yet been cleaned up.
-                activated: state.sector_start_epoch,
-                terminated: state.slash_epoch,
-            }),
+            Some(state) => {
+                if state.slash_epoch != EPOCH_UNDEFINED {
+                    // Deal was terminated asynchronously
+                    // TODO: https://github.com/filecoin-project/builtin-actors/issues/1388
+                    Err(ActorError::unchecked(
+                        EX_DEAL_EXPIRED,
+                        format!("deal {} expired", params.id),
+                    ))
+                } else {
+                    // If we have state, the deal has been activated
+                    Ok(GetDealActivationReturn {
+                        activated: state.sector_start_epoch,
+                        terminated: state.slash_epoch,
+                    })
+                }
+            }
             None => {
                 let maybe_proposal = st.find_proposal(rt.store(), params.id)?;
                 match maybe_proposal {
diff --git a/actors/market/tests/transient_marked_for_termination.rs b/actors/market/tests/transient_marked_for_termination.rs
index 7507b80c5..7287987aa 100644
--- a/actors/market/tests/transient_marked_for_termination.rs
+++ b/actors/market/tests/transient_marked_for_termination.rs
@@ -6,28 +6,34 @@ mod harness;
 
 use std::collections::BTreeMap;
 
-use fil_actor_market::{DealSettlementSummary, State, EX_DEAL_EXPIRED};
-use fil_actors_runtime::{runtime::Runtime, BURNT_FUNDS_ACTOR_ADDR, EPOCHS_IN_DAY};
+use fil_actor_market::{
+    Actor as MarketActor, DealQueryParams, DealSettlementSummary, Method, State, EX_DEAL_EXPIRED,
+};
+use fil_actors_runtime::{
+    runtime::Runtime,
+    test_utils::{expect_abort_contains_message, MockRuntime},
+    ActorError, BURNT_FUNDS_ACTOR_ADDR, EPOCHS_IN_DAY,
+};
+use fvm_ipld_encoding::ipld_block::IpldBlock;
 use fvm_shared::{clock::ChainEpoch, error::ExitCode};
 use harness::*;
 
+const START_EPOCH: ChainEpoch = 5;
 const SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH: ChainEpoch = 200;
+const END_EPOCH: ChainEpoch = SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH + 200 * EPOCHS_IN_DAY;
 
 #[test]
 fn deal_scheduled_for_termination_cannot_be_settled_manually() {
-    let start_epoch = 5;
-    let end_epoch = SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH + 200 * EPOCHS_IN_DAY;
-
     let rt = setup();
 
     let (deal_id_1, deal_1_prop) = publish_and_activate_deal_legacy(
         &rt,
         CLIENT_ADDR,
         &MinerAddresses::default(),
-        start_epoch,
-        end_epoch,
+        START_EPOCH,
+        END_EPOCH,
         0,
-        end_epoch,
+        END_EPOCH,
     );
 
     // mark this deal for termination
@@ -35,10 +41,10 @@ fn deal_scheduled_for_termination_cannot_be_settled_manually() {
         &rt,
         CLIENT_ADDR,
         &MinerAddresses::default(),
-        start_epoch,
-        end_epoch,
+        START_EPOCH,
+        END_EPOCH,
         0,
-        end_epoch,
+        END_EPOCH,
     );
 
     let slashed_epoch = SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH - 1;
@@ -92,10 +98,66 @@ fn deal_scheduled_for_termination_cannot_be_settled_manually() {
     rt.set_epoch(scheduled_epoch + 1);
     let ret = settle_deal_payments(&rt, PROVIDER_ADDR, &[deal_id_1, slashed_deal]);
     let expected_payment =
-        deal_1_prop.storage_price_per_epoch * (scheduled_epoch + 1 - start_epoch);
+        deal_1_prop.storage_price_per_epoch * (scheduled_epoch + 1 - START_EPOCH);
     assert_eq!(ret.results.codes(), vec![ExitCode::OK, EX_DEAL_EXPIRED]);
     assert_eq!(
         ret.settlements[0],
         DealSettlementSummary { completed: false, payment: expected_payment }
     );
 }
+
+#[test]
+fn cannot_get_deal_activation_for_marked_for_termination_deal() {
+    let rt = setup();
+    // create a deal and mark it for termination
+    let (slashed_deal, _) = publish_and_activate_deal_legacy(
+        &rt,
+        CLIENT_ADDR,
+        &MinerAddresses::default(),
+        START_EPOCH,
+        END_EPOCH,
+        0,
+        END_EPOCH,
+    );
+
+    let slashed_epoch = SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH - 1;
+    let scheduled_epoch = SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH + 2;
+
+    // simulate one of the deals being marked for termination before the code switchover but scheduled for cron after
+    {
+        let mut state = rt.get_state::<State>();
+
+        // slashing before the code switchover just marks the epoch in DealState
+        let mut slashed_deal_state =
+            state.remove_deal_state(rt.store(), slashed_deal).unwrap().unwrap();
+        slashed_deal_state.slash_epoch = slashed_epoch;
+        state.put_deal_states(rt.store(), &[(slashed_deal, slashed_deal_state)]).unwrap();
+
+        // actual slashing scheduled for cron after the code switchover
+        let mut deals_by_epoch = BTreeMap::new();
+        deals_by_epoch.insert(scheduled_epoch, vec![slashed_deal]);
+        state.put_batch_deals_by_epoch(rt.store(), &deals_by_epoch).unwrap();
+
+        rt.replace_state(&state);
+    }
+
+    // code updated before cron is run
+    rt.set_epoch(SYNCHRONOUS_TERMINATION_SWITCHOVER_EPOCH);
+
+    // attempt to get deal activation for the slashed deal - fails because it's marked-for-termination
+    expect_abort_contains_message(
+        EX_DEAL_EXPIRED,
+        &format!("deal {slashed_deal} expired"),
+        query_deal_raw(&rt, Method::GetDealActivationExported, slashed_deal),
+    );
+}
+
+fn query_deal_raw(
+    rt: &MockRuntime,
+    method: Method,
+    id: u64,
+) -> Result<Option<IpldBlock>, ActorError> {
+    let params = DealQueryParams { id };
+    rt.expect_validate_caller_any();
+    rt.call::<MarketActor>(method as u64, IpldBlock::serialize_cbor(&params).unwrap())
+}