diff --git a/programs/mango-v4/src/lib.rs b/programs/mango-v4/src/lib.rs
index 55b47a4be..b97203fff 100644
--- a/programs/mango-v4/src/lib.rs
+++ b/programs/mango-v4/src/lib.rs
@@ -614,8 +614,14 @@ pub mod mango_v4 {
         // Use this to limit compute used during order matching.
         // When the limit is reached, processing stops and the instruction succeeds.
         limit: u8,
+
+        // Oracle staleness limit, in slots. Set to -1 to disable.
+        //
+        // WARNING: Not currently implemented.
+        max_oracle_staleness_slots: i32,
     ) -> Result<()> {
         require_gte!(peg_limit, -1);
+        require_eq!(max_oracle_staleness_slots, -1); // unimplemented
 
         use crate::state::{Order, OrderParams};
         let time_in_force = match Order::tif_from_expiry(expiry_timestamp) {
@@ -636,6 +642,7 @@ pub mod mango_v4 {
                 price_offset_lots,
                 order_type: order_type.to_post_order_type()?,
                 peg_limit,
+                max_oracle_staleness_slots,
             },
         };
         instructions::perp_place_order(ctx, order, limit)
diff --git a/programs/mango-v4/src/state/orderbook/order.rs b/programs/mango-v4/src/state/orderbook/order.rs
index 245ee10de..be40bab27 100644
--- a/programs/mango-v4/src/state/orderbook/order.rs
+++ b/programs/mango-v4/src/state/orderbook/order.rs
@@ -39,7 +39,7 @@ pub enum OrderParams {
         price_offset_lots: i64,
         order_type: PostOrderType,
         peg_limit: i64,
-        // TODO: oracle_staleness
+        max_oracle_staleness_slots: i32,
     },
 }
 
diff --git a/programs/mango-v4/tests/program_test/mango_client.rs b/programs/mango-v4/tests/program_test/mango_client.rs
index 85d95e653..fb8b2ca03 100644
--- a/programs/mango-v4/tests/program_test/mango_client.rs
+++ b/programs/mango-v4/tests/program_test/mango_client.rs
@@ -2739,6 +2739,7 @@ impl ClientInstruction for PerpPlaceOrderPeggedInstruction {
             reduce_only: false,
             expiry_timestamp: 0,
             limit: 10,
+            max_oracle_staleness_slots: -1,
         };
 
         let perp_market: PerpMarket = account_loader.load(&self.perp_market).await.unwrap();
diff --git a/ts/client/src/client.ts b/ts/client/src/client.ts
index 61af2b56c..61df19d63 100644
--- a/ts/client/src/client.ts
+++ b/ts/client/src/client.ts
@@ -1757,6 +1757,7 @@ export class MangoClient {
         reduceOnly ? reduceOnly : false,
         new BN(expiryTimestamp ? expiryTimestamp : 0),
         limit ? limit : 10,
+        -1,
       )
       .accounts({
         group: group.publicKey,
diff --git a/ts/client/src/mango_v4.ts b/ts/client/src/mango_v4.ts
index e32a18bc6..f2f1123cd 100644
--- a/ts/client/src/mango_v4.ts
+++ b/ts/client/src/mango_v4.ts
@@ -2860,6 +2860,10 @@ export type MangoV4 = {
         {
           "name": "limit",
           "type": "u8"
+        },
+        {
+          "name": "maxOracleStalenessSlots",
+          "type": "i32"
         }
       ]
     },
@@ -4917,19 +4921,14 @@ export type MangoV4 = {
             }
           },
           {
-            "name": "padding2",
-            "docs": [
-              "Tracks what the position is to calculate average entry & break even price"
-            ],
-            "type": {
-              "array": [
-                "u8",
-                8
-              ]
-            }
+            "name": "settlePnlLimitSettledInCurrentWindowNative",
+            "type": "i64"
           },
           {
             "name": "quoteRunningNative",
+            "docs": [
+              "Tracks what the position is to calculate average entry & break even price"
+            ],
             "type": "i64"
           },
           {
@@ -4999,11 +4998,9 @@ export type MangoV4 = {
           },
           {
             "name": "realizedPnlNative",
-            "type": "i64"
-          },
-          {
-            "name": "settlePnlLimitSettledInCurrentWindowNative",
-            "type": "i64"
+            "type": {
+              "defined": "I80F48"
+            }
           }
         ]
       }
@@ -6041,6 +6038,10 @@ export type MangoV4 = {
               {
                 "name": "peg_limit",
                 "type": "i64"
+              },
+              {
+                "name": "max_oracle_staleness_slots",
+                "type": "i32"
               }
             ]
           }
@@ -10058,6 +10059,10 @@ export const IDL: MangoV4 = {
         {
           "name": "limit",
           "type": "u8"
+        },
+        {
+          "name": "maxOracleStalenessSlots",
+          "type": "i32"
         }
       ]
     },
@@ -12115,19 +12120,14 @@ export const IDL: MangoV4 = {
             }
           },
           {
-            "name": "padding2",
-            "docs": [
-              "Tracks what the position is to calculate average entry & break even price"
-            ],
-            "type": {
-              "array": [
-                "u8",
-                8
-              ]
-            }
+            "name": "settlePnlLimitSettledInCurrentWindowNative",
+            "type": "i64"
           },
           {
             "name": "quoteRunningNative",
+            "docs": [
+              "Tracks what the position is to calculate average entry & break even price"
+            ],
             "type": "i64"
           },
           {
@@ -12197,11 +12197,9 @@ export const IDL: MangoV4 = {
           },
           {
             "name": "realizedPnlNative",
-            "type": "i64"
-          },
-          {
-            "name": "settlePnlLimitSettledInCurrentWindowNative",
-            "type": "i64"
+            "type": {
+              "defined": "I80F48"
+            }
           }
         ]
       }
@@ -13239,6 +13237,10 @@ export const IDL: MangoV4 = {
               {
                 "name": "peg_limit",
                 "type": "i64"
+              },
+              {
+                "name": "max_oracle_staleness_slots",
+                "type": "i32"
               }
             ]
           }