diff --git a/Services/CO.CDP.Organisation.WebApi.Tests/UseCase/GetOrganisationMouSignatureLatestUseCaseTest.cs b/Services/CO.CDP.Organisation.WebApi.Tests/UseCase/GetOrganisationMouSignatureLatestUseCaseTest.cs
index 6f4ca6caf..1d0b85fe9 100644
--- a/Services/CO.CDP.Organisation.WebApi.Tests/UseCase/GetOrganisationMouSignatureLatestUseCaseTest.cs
+++ b/Services/CO.CDP.Organisation.WebApi.Tests/UseCase/GetOrganisationMouSignatureLatestUseCaseTest.cs
@@ -77,7 +77,7 @@ public async Task Execute_ShouldThrowInvalidOperationException_WhenNoMouSignatur
 
         Func<Task> act = async () => await _useCase.Execute(organisation.Guid);
 
-        await act.Should().ThrowAsync<InvalidOperationException>()
+        await act.Should().ThrowAsync<UnknownMouException>()
             .WithMessage($"No MOU signatures found for organisation {organisation.Guid}.");
     }