diff --git a/libs/auth/src/common/login-strategies/auth-request-login.strategy.spec.ts b/libs/auth/src/common/login-strategies/auth-request-login.strategy.spec.ts
index a3e2b16a5a..0dc136ffd4 100644
--- a/libs/auth/src/common/login-strategies/auth-request-login.strategy.spec.ts
+++ b/libs/auth/src/common/login-strategies/auth-request-login.strategy.spec.ts
@@ -121,7 +121,7 @@ describe("AuthRequestLoginStrategy", () => {
     const userKey = new SymmetricCryptoKey(new Uint8Array(64).buffer as CsprngArray) as UserKey;
 
     masterPasswordService.masterKeySubject.next(masterKey);
-    masterPasswordService.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
+    masterPasswordService.mock.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
 
     await authRequestLoginStrategy.logIn(credentials);
 
diff --git a/libs/auth/src/common/login-strategies/login.strategy.spec.ts b/libs/auth/src/common/login-strategies/login.strategy.spec.ts
index 698ae8f054..c24e05101e 100644
--- a/libs/auth/src/common/login-strategies/login.strategy.spec.ts
+++ b/libs/auth/src/common/login-strategies/login.strategy.spec.ts
@@ -248,7 +248,7 @@ describe("LoginStrategy", () => {
 
       apiService.postIdentityToken.mockResolvedValue(tokenResponse);
       masterPasswordService.masterKeySubject.next(masterKey);
-      masterPasswordService.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
+      masterPasswordService.mock.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
 
       const result = await passwordLoginStrategy.logIn(credentials);
 
@@ -267,7 +267,7 @@ describe("LoginStrategy", () => {
 
       apiService.postIdentityToken.mockResolvedValue(tokenResponse);
       masterPasswordService.masterKeySubject.next(masterKey);
-      masterPasswordService.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
+      masterPasswordService.mock.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
 
       await passwordLoginStrategy.logIn(credentials);
 
diff --git a/libs/auth/src/common/login-strategies/sso-login.strategy.spec.ts b/libs/auth/src/common/login-strategies/sso-login.strategy.spec.ts
index 6679145434..fc03e1dd68 100644
--- a/libs/auth/src/common/login-strategies/sso-login.strategy.spec.ts
+++ b/libs/auth/src/common/login-strategies/sso-login.strategy.spec.ts
@@ -435,7 +435,7 @@ describe("SsoLoginStrategy", () => {
 
       apiService.postIdentityToken.mockResolvedValue(tokenResponse);
       masterPasswordService.masterKeySubject.next(masterKey);
-      masterPasswordService.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
+      masterPasswordService.mock.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
 
       await ssoLoginStrategy.logIn(credentials);
 
@@ -486,7 +486,7 @@ describe("SsoLoginStrategy", () => {
 
       apiService.postIdentityToken.mockResolvedValue(tokenResponse);
       masterPasswordService.masterKeySubject.next(masterKey);
-      masterPasswordService.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
+      masterPasswordService.mock.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
 
       await ssoLoginStrategy.logIn(credentials);
 
diff --git a/libs/auth/src/common/login-strategies/user-api-login.strategy.spec.ts b/libs/auth/src/common/login-strategies/user-api-login.strategy.spec.ts
index ff56b08831..f365a2d178 100644
--- a/libs/auth/src/common/login-strategies/user-api-login.strategy.spec.ts
+++ b/libs/auth/src/common/login-strategies/user-api-login.strategy.spec.ts
@@ -184,7 +184,7 @@ describe("UserApiLoginStrategy", () => {
 
     apiService.postIdentityToken.mockResolvedValue(tokenResponse);
     masterPasswordService.masterKeySubject.next(masterKey);
-    masterPasswordService.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
+    masterPasswordService.mock.decryptUserKeyWithMasterKey.mockResolvedValue(userKey);
 
     await apiLogInStrategy.logIn(credentials);
 
diff --git a/libs/common/src/auth/abstractions/master-password.service.abstraction.ts b/libs/common/src/auth/abstractions/master-password.service.abstraction.ts
index 0e47edd3ce..4be690c644 100644
--- a/libs/common/src/auth/abstractions/master-password.service.abstraction.ts
+++ b/libs/common/src/auth/abstractions/master-password.service.abstraction.ts
@@ -87,9 +87,9 @@ export abstract class InternalMasterPasswordServiceAbstraction extends MasterPas
    * @param userId The desired user
    * @returns The user key
    */
-  abstract decryptUserKeyWithMasterKey(
+  abstract decryptUserKeyWithMasterKey: (
     masterKey: MasterKey,
     userKey?: EncString,
     userId?: string,
-  ): Promise<UserKey>;
+  ) => Promise<UserKey>;
 }