diff --git a/core/src/transaction_ffi.rs b/core/src/transaction_ffi.rs
index 925f329d88ad49..ec10f014c0f8bc 100644
--- a/core/src/transaction_ffi.rs
+++ b/core/src/transaction_ffi.rs
@@ -27,6 +27,11 @@ pub unsafe fn create_transaction_interface<Tx: SVMTransaction>(
         transaction.signatures().as_ptr() as *const u8
     }
 
+    extern "C" fn num_total_signatures<Tx: SVMTransaction>(transaction_ptr: TransactionPtr) -> u64 {
+        let transaction = unsafe { &*(transaction_ptr as *const Tx) };
+        transaction.num_total_signatures()
+    }
+
     extern "C" fn num_write_locks<Tx: SVMTransaction>(transaction_ptr: TransactionPtr) -> u64 {
         let transaction = unsafe { &*(transaction_ptr as *const Tx) };
         transaction.num_write_locks()
@@ -121,6 +126,7 @@ pub unsafe fn create_transaction_interface<Tx: SVMTransaction>(
         transaction_ptr: transaction as *const Tx as *const core::ffi::c_void,
         num_signatures_fn: num_signatures::<Tx>,
         signatures_fn: signatures::<Tx>,
+        num_total_signatures_fn: num_total_signatures::<Tx>,
         num_write_locks_fn: num_write_locks::<Tx>,
         recent_blockhash_fn: recent_blockhash::<Tx>,
         num_instructions_fn: num_instructions::<Tx>,
diff --git a/transaction-ffi/src/lib.rs b/transaction-ffi/src/lib.rs
index 309505a4ef3979..b1bae9abe9b71a 100644
--- a/transaction-ffi/src/lib.rs
+++ b/transaction-ffi/src/lib.rs
@@ -22,6 +22,16 @@ pub type TransactionNumSignaturesFn =
 pub type TransactionSignaturesFn =
     unsafe extern "C" fn(transaction_ptr: TransactionPtr) -> *const u8;
 
+/// Returns the total number of signatures in the transaction, including any
+/// pre-compile signatures.
+/// WARNING: This function should not be used to determine the number of
+/// signatures returned by `TransactionSignaturesFn`. Instead, use
+/// `TransactionNumSignaturesFn`.
+/// # Safety
+/// - The transaction pointer must be valid.
+pub type TransactionNumTotalSignatures =
+    unsafe extern "C" fn(transaction_ptr: TransactionPtr) -> u64;
+
 /// Returns the number of requested write-locks in this transaction.
 /// This does not consider if write-locks are demoted.
 /// # Safety
@@ -159,6 +169,10 @@ pub struct TransactionInterface {
     /// Returns pointer to the first signature in the transaction.
     /// See [`TransactionSignaturesFn`].
     pub signatures_fn: TransactionSignaturesFn,
+    /// Returns the total number of signatures in the transaction, including
+    /// any pre-compile signatures.
+    /// See [`TransactionNumTotalSignatures`].
+    pub num_total_signatures_fn: TransactionNumTotalSignatures,
     /// Returns the number of requested write-locks in this transaction.
     /// See [`TransactionNumWriteLocksFn`].
     pub num_write_locks_fn: TransactionNumWriteLocksFn,