diff --git a/aa-sdk/core/src/middleware/defaults/7702gasEstimator.ts b/aa-sdk/core/src/middleware/defaults/7702gasEstimator.ts
index 89249aa605..45f6b135d0 100644
--- a/aa-sdk/core/src/middleware/defaults/7702gasEstimator.ts
+++ b/aa-sdk/core/src/middleware/defaults/7702gasEstimator.ts
@@ -70,7 +70,7 @@ export const default7702GasEstimator: (
 
     // Note: does not omit the delegation from estimation if the account is already 7702 delegated.
 
-    (struct as UserOperationStruct<"0.7.0">).eip7702auth = {
+    (struct as UserOperationStruct<"0.7.0">).eip7702Auth = {
       chainId: toHex(params.client.chain.id),
       nonce: toHex(accountNonce),
       address: implementationAddress,
@@ -81,7 +81,7 @@ export const default7702GasEstimator: (
 
     const estimatedUO = await gasEstimator_(struct, params);
 
-    estimatedUO.eip7702auth = undefined; // Strip out the auth after estimation.
+    estimatedUO.eip7702Auth = undefined; // Strip out the auth after estimation.
 
     return estimatedUO;
   };
diff --git a/aa-sdk/core/src/middleware/defaults/7702signer.ts b/aa-sdk/core/src/middleware/defaults/7702signer.ts
index 68ce1c8e46..7a13405b1f 100644
--- a/aa-sdk/core/src/middleware/defaults/7702signer.ts
+++ b/aa-sdk/core/src/middleware/defaults/7702signer.ts
@@ -92,7 +92,7 @@ export const default7702UserOpSigner: (
 
     return {
       ...uo,
-      eip7702auth: {
+      eip7702Auth: {
         // deepHexlify doesn't encode number(0) correctly, it returns "0x"
         chainId: toHex(client.chain.id),
         nonce: toHex(accountNonce),
diff --git a/aa-sdk/core/src/types.ts b/aa-sdk/core/src/types.ts
index 435c5a87dd..44770da153 100644
--- a/aa-sdk/core/src/types.ts
+++ b/aa-sdk/core/src/types.ts
@@ -202,7 +202,7 @@ export interface UserOperationRequest_v7 {
 // [!endregion UserOperationRequest_v7]
 
 export type Eip7702ExtendedFields = {
-  eip7702auth?: {
+  eip7702Auth?: {
     chainId: Hex;
     nonce: Hex;
     address: Address;