diff --git a/l1-contracts/src/core/libraries/ConstantsGen.sol b/l1-contracts/src/core/libraries/ConstantsGen.sol
index 6f1202c6c097..d429deaa406e 100644
--- a/l1-contracts/src/core/libraries/ConstantsGen.sol
+++ b/l1-contracts/src/core/libraries/ConstantsGen.sol
@@ -69,10 +69,10 @@ library Constants {
   uint256 internal constant L1_TO_L2_MSG_SUBTREE_HEIGHT = 4;
   uint256 internal constant L1_TO_L2_MSG_SUBTREE_SIBLING_PATH_LENGTH = 12;
   uint256 internal constant FUNCTION_SELECTOR_NUM_BYTES = 4;
-  uint256 internal constant MAPPING_SLOT_PEDERSEN_SEPARATOR = 4;
   uint256 internal constant NUM_FIELDS_PER_SHA256 = 2;
   uint256 internal constant ARGS_HASH_CHUNK_LENGTH = 32;
   uint256 internal constant ARGS_HASH_CHUNK_COUNT = 32;
+  uint256 internal constant INITIALIZATION_SLOT_SEPARATOR = 1000;
   uint256 internal constant MAX_PACKED_PUBLIC_BYTECODE_SIZE_IN_FIELDS = 1000;
   uint256 internal constant MAX_PACKED_BYTECODE_SIZE_PER_PRIVATE_FUNCTION_IN_FIELDS = 500;
   uint256 internal constant MAX_PACKED_BYTECODE_SIZE_PER_UNCONSTRAINED_FUNCTION_IN_FIELDS = 500;
diff --git a/noir-projects/aztec-nr/aztec/src/state_vars/shared_immutable.nr b/noir-projects/aztec-nr/aztec/src/state_vars/shared_immutable.nr
index fd122875b42d..32e0c82d68b2 100644
--- a/noir-projects/aztec-nr/aztec/src/state_vars/shared_immutable.nr
+++ b/noir-projects/aztec-nr/aztec/src/state_vars/shared_immutable.nr
@@ -2,7 +2,7 @@ use crate::{
     context::Context, history::public_value_inclusion::prove_public_value_inclusion,
     oracle::{storage::{storage_read, storage_write}}, state_vars::storage::Storage
 };
-use dep::protocol_types::traits::{Deserialize, Serialize};
+use dep::protocol_types::{constants::INITIALIZATION_SLOT_SEPARATOR, traits::{Deserialize, Serialize}};
 
 struct SharedImmutable<T>{
     context: Context,
@@ -34,7 +34,7 @@ impl<T> SharedImmutable<T> {
         // );
 
         // We check that the struct is not yet initialized by checking if the initialization slot is 0
-        let initialization_slot = self.storage_slot - 1;
+        let initialization_slot = INITIALIZATION_SLOT_SEPARATOR + self.storage_slot;
         let fields_read: [Field; 1] = storage_read(initialization_slot);
         assert(fields_read[0] == 0, "SharedImmutable already initialized");
 
diff --git a/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr b/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr
index be81885d0591..480b0f825e7d 100644
--- a/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr
+++ b/noir-projects/noir-protocol-circuits/src/crates/types/src/constants.nr
@@ -93,11 +93,11 @@ global L1_TO_L2_MSG_SUBTREE_SIBLING_PATH_LENGTH: Field = 12;
 
 // MISC CONSTANTS
 global FUNCTION_SELECTOR_NUM_BYTES: Field = 4;
-global MAPPING_SLOT_PEDERSEN_SEPARATOR: Field = 4;
 // sha256 hash is stored in two fields to accommodate all 256-bits of the hash
 global NUM_FIELDS_PER_SHA256: Field = 2;
 global ARGS_HASH_CHUNK_LENGTH: u32 = 32;
 global ARGS_HASH_CHUNK_COUNT: u32 = 32;
+global INITIALIZATION_SLOT_SEPARATOR: Field = 1000;
 
 // CONTRACT CLASS CONSTANTS
 // This should be around 8192 (assuming 2**15 instructions packed at 8 bytes each),
diff --git a/noir/aztec_macros/src/lib.rs b/noir/aztec_macros/src/lib.rs
index 5a4ea56396d3..1826d77b9bfb 100644
--- a/noir/aztec_macros/src/lib.rs
+++ b/noir/aztec_macros/src/lib.rs
@@ -932,8 +932,7 @@ fn assign_storage_slots(
                 )),
             }?;
 
-            // We start from 2 because 0 storage slot is buggy and 1 is reserved for the initialization slot
-            let mut storage_slot: u64 = 2;
+            let mut storage_slot: u64 = 1;
             for (index, (_, expr_id)) in storage_constructor_expression.fields.iter().enumerate() {
                 let fields = r#struct.borrow().get_fields(&[]);
                 let (_, field_type) = fields.get(index).unwrap();
@@ -980,9 +979,7 @@ fn assign_storage_slots(
                     ));
                 });
 
-                // We add 1 on the next line because some of the types use value in initialization storage slot
-                // (set as "type storage slot - 1") to determine whether the value in the type was already initialized.
-                storage_slot += type_serialized_len + 1;
+                storage_slot += type_serialized_len;
             }
         }
     }
diff --git a/yarn-project/circuits.js/src/constants.gen.ts b/yarn-project/circuits.js/src/constants.gen.ts
index 47bbff17361c..9be3302b9b1e 100644
--- a/yarn-project/circuits.js/src/constants.gen.ts
+++ b/yarn-project/circuits.js/src/constants.gen.ts
@@ -55,10 +55,10 @@ export const PUBLIC_DATA_SUBTREE_SIBLING_PATH_LENGTH = 35;
 export const L1_TO_L2_MSG_SUBTREE_HEIGHT = 4;
 export const L1_TO_L2_MSG_SUBTREE_SIBLING_PATH_LENGTH = 12;
 export const FUNCTION_SELECTOR_NUM_BYTES = 4;
-export const MAPPING_SLOT_PEDERSEN_SEPARATOR = 4;
 export const NUM_FIELDS_PER_SHA256 = 2;
 export const ARGS_HASH_CHUNK_LENGTH = 32;
 export const ARGS_HASH_CHUNK_COUNT = 32;
+export const INITIALIZATION_SLOT_SEPARATOR = 1000;
 export const MAX_PACKED_PUBLIC_BYTECODE_SIZE_IN_FIELDS = 1000;
 export const MAX_PACKED_BYTECODE_SIZE_PER_PRIVATE_FUNCTION_IN_FIELDS = 500;
 export const MAX_PACKED_BYTECODE_SIZE_PER_UNCONSTRAINED_FUNCTION_IN_FIELDS = 500;