diff --git a/runtime/src/bank.rs b/runtime/src/bank.rs
index 9661c104e15311..e660b8bf4265f4 100644
--- a/runtime/src/bank.rs
+++ b/runtime/src/bank.rs
@@ -223,6 +223,8 @@ pub(crate) struct BankFieldsToDeserialize {
     pub(crate) stakes: Stakes,
     pub(crate) epoch_stakes: HashMap<Epoch, EpochStakes>,
     pub(crate) is_delta: bool,
+    // Stop wrapping with Option once we are after snapshot version 1.X!
+    pub(crate) operating_mode: Option<solana_sdk::genesis_config::OperatingMode>,
 }
 
 // Bank's common fields shared by all supported snapshot versions for serialization.
@@ -261,6 +263,7 @@ pub(crate) struct BankFieldsToSerialize<'a> {
     pub(crate) stakes: &'a RwLock<Stakes>,
     pub(crate) epoch_stakes: &'a HashMap<Epoch, EpochStakes>,
     pub(crate) is_delta: bool,
+    pub(crate) operating_mode: OperatingMode,
 }
 
 /// Manager for the state of all accounts and programs after processing its entries.
@@ -381,6 +384,7 @@ pub struct Bank {
 
     pub skip_drop: AtomicBool,
 
+    // Stop wrapping with Option once we are after snapshot version 1.X!
     pub operating_mode: Option<OperatingMode>,
 
     pub lazy_rent_collection: AtomicBool,
@@ -602,7 +606,10 @@ impl Bank {
             last_vote_sync: new(),
             rewards: new(),
             skip_drop: new(),
-            operating_mode: Some(genesis_config.operating_mode),
+            // Always use fields.operating_mode once we are after snapshot version 1.X! and stop using genesis_config
+            operating_mode: fields
+                .operating_mode
+                .or(Some(genesis_config.operating_mode)),
             lazy_rent_collection: new(),
         };
         bank.finish_init();
@@ -643,6 +650,7 @@ impl Bank {
             stakes: &self.stakes,
             epoch_stakes: &self.epoch_stakes,
             is_delta: self.is_delta.load(Ordering::Relaxed),
+            operating_mode: self.operating_mode.unwrap(),
         }
     }
 
diff --git a/runtime/src/serde_snapshot/future.rs b/runtime/src/serde_snapshot/future.rs
index 8629166cd9be28..57951b0a4121c6 100644
--- a/runtime/src/serde_snapshot/future.rs
+++ b/runtime/src/serde_snapshot/future.rs
@@ -1,4 +1,3 @@
-use super::common::*;
 use {super::*, solana_measure::measure::Measure, std::cell::RefCell};
 
 type AccountsDbFields = super::AccountsDbFields<SerializableAccountStorageEntry>;
@@ -60,10 +59,10 @@ pub(crate) struct DeserializableVersionedBank {
     pub(crate) epoch_schedule: EpochSchedule,
     pub(crate) inflation: Inflation,
     pub(crate) stakes: Stakes,
-    pub(crate) unused_accounts: UnusedAccounts,
     pub(crate) epoch_stakes: HashMap<Epoch, EpochStakes>,
     pub(crate) is_delta: bool,
     pub(crate) message_processor: MessageProcessor,
+    pub(crate) operating_mode: solana_sdk::genesis_config::OperatingMode,
 }
 
 impl Into<BankFieldsToDeserialize> for DeserializableVersionedBank {
@@ -100,6 +99,7 @@ impl Into<BankFieldsToDeserialize> for DeserializableVersionedBank {
             stakes: self.stakes,
             epoch_stakes: self.epoch_stakes,
             is_delta: self.is_delta,
+            operating_mode: Some(self.operating_mode),
         }
     }
 }
@@ -136,10 +136,10 @@ pub(crate) struct SerializableVersionedBank<'a> {
     pub(crate) epoch_schedule: EpochSchedule,
     pub(crate) inflation: Inflation,
     pub(crate) stakes: &'a RwLock<Stakes>,
-    pub(crate) unused_accounts: UnusedAccounts,
     pub(crate) epoch_stakes: &'a HashMap<Epoch, EpochStakes>,
     pub(crate) is_delta: bool,
     pub(crate) message_processor: MessageProcessor,
+    pub(crate) operating_mode: solana_sdk::genesis_config::OperatingMode,
 }
 
 impl<'a> From<crate::bank::BankFieldsToSerialize<'a>> for SerializableVersionedBank<'a> {
@@ -177,10 +177,10 @@ impl<'a> From<crate::bank::BankFieldsToSerialize<'a>> for SerializableVersionedB
             epoch_schedule: rhs.epoch_schedule,
             inflation: rhs.inflation,
             stakes: rhs.stakes,
-            unused_accounts: new(),
             epoch_stakes: rhs.epoch_stakes,
             is_delta: rhs.is_delta,
             message_processor: new(),
+            operating_mode: rhs.operating_mode,
         }
     }
 }
diff --git a/runtime/src/serde_snapshot/legacy.rs b/runtime/src/serde_snapshot/legacy.rs
index f0dd71d8e41ae8..066e39087e6780 100644
--- a/runtime/src/serde_snapshot/legacy.rs
+++ b/runtime/src/serde_snapshot/legacy.rs
@@ -170,6 +170,7 @@ impl Into<BankFieldsToDeserialize> for DeserializableVersionedBank {
             stakes: self.stakes,
             epoch_stakes: self.epoch_stakes,
             is_delta: self.is_delta,
+            operating_mode: None,
         }
     }
 }