diff --git a/src/processor.rs b/src/processor.rs
index b7c9d38..26ebc1a 100644
--- a/src/processor.rs
+++ b/src/processor.rs
@@ -444,15 +444,28 @@ fn process_init_pool(
     // pointing to it, and drain the vault via FlushToInsurance PDA-signer propagation.
     // The devnet program ID has no legitimate use on mainnet; gate it with the
     // "devnet" feature flag so it only compiles in when explicitly requested.
+    //
+    // #257: the legacy PERCOLATOR_DEVNET address above predates the v17 wrapper cutover.
+    // percolator-sdk's PROGRAM_IDS_V17.percolator ("69VUZ7a2BeXBTpRRManLamF5UWTaNR9B1hy5Se3cdXy9")
+    // is a SEPARATE, newer devnet-only deployment (SDK comment: "Mainnet addresses are
+    // pending the mainnet cutover (Phase 7 gate)" — there is no canonical v17 MAINNET
+    // address yet). Add it alongside, not in place of, the legacy devnet address, and
+    // keep it under the SAME "devnet" feature gate as PERCOLATOR_DEVNET for the same
+    // N-3 reason: it has no legitimate use on mainnet either.
     {
         const PERCOLATOR_MAINNET: Pubkey =
             solana_program::pubkey!("ESa89R5Es3rJ5mnwGybVRG1GrNt9etP11Z5V2QWD4edv");
         #[cfg(feature = "devnet")]
         const PERCOLATOR_DEVNET: Pubkey =
             solana_program::pubkey!("FxfD37s1AZTeWfFQps9Zpebi2dNQ9QSSDtfMKdbsfKrD");
+        #[cfg(feature = "devnet")]
+        const PERCOLATOR_V17_DEVNET: Pubkey =
+            solana_program::pubkey!("69VUZ7a2BeXBTpRRManLamF5UWTaNR9B1hy5Se3cdXy9");
         let is_valid = *percolator_program.key == PERCOLATOR_MAINNET;
         #[cfg(feature = "devnet")]
-        let is_valid = is_valid || *percolator_program.key == PERCOLATOR_DEVNET;
+        let is_valid = is_valid
+            || *percolator_program.key == PERCOLATOR_DEVNET
+            || *percolator_program.key == PERCOLATOR_V17_DEVNET;
         if !is_valid {
             msg!(
                 "Error: invalid percolator program {}",
diff --git a/tests/unit.rs b/tests/unit.rs
index 7aad44e..705ec7d 100644
--- a/tests/unit.rs
+++ b/tests/unit.rs
@@ -933,6 +933,29 @@ fn test_percolator_program_allowlist_constants_match_nft() {
     assert_ne!(devnet, Pubkey::default(), "devnet ID must not be zero");
 }
 
+#[test]
+fn test_v17_devnet_wrapper_allowlist_constant_matches_sdk() {
+    // #257: percolator-sdk's PROGRAM_IDS_V17.percolator is a separate, newer
+    // devnet-only deployment from the legacy PERCOLATOR_DEVNET above (the SDK's
+    // own comment notes mainnet v17 addresses are "pending the mainnet cutover" —
+    // there is no canonical v17 MAINNET address yet, so only a devnet allowlist
+    // entry is correct here). This test encodes the expected value so drift is
+    // caught at test time, mirroring test_percolator_program_allowlist_constants_match_nft.
+    use solana_program::pubkey::Pubkey;
+
+    let mainnet: Pubkey = solana_program::pubkey!("ESa89R5Es3rJ5mnwGybVRG1GrNt9etP11Z5V2QWD4edv");
+    let legacy_devnet: Pubkey =
+        solana_program::pubkey!("FxfD37s1AZTeWfFQps9Zpebi2dNQ9QSSDtfMKdbsfKrD");
+    let v17_devnet: Pubkey = solana_program::pubkey!("69VUZ7a2BeXBTpRRManLamF5UWTaNR9B1hy5Se3cdXy9");
+
+    assert_ne!(v17_devnet, mainnet, "v17 devnet wrapper must differ from mainnet");
+    assert_ne!(
+        v17_devnet, legacy_devnet,
+        "v17 devnet wrapper must differ from the legacy (pre-v17) devnet wrapper"
+    );
+    assert_ne!(v17_devnet, Pubkey::default(), "v17 devnet ID must not be zero");
+}
+
 #[test]
 fn test_pool_stores_percolator_program() {
     // Verify that a StakePool's percolator_program field is a full 32-byte pubkey.