diff --git a/src/bosh-director/spec/unit/bosh/director/nats_client_cert_generator_spec.rb b/src/bosh-director/spec/unit/bosh/director/nats_client_cert_generator_spec.rb
index c204892af9..8c1271716e 100644
--- a/src/bosh-director/spec/unit/bosh/director/nats_client_cert_generator_spec.rb
+++ b/src/bosh-director/spec/unit/bosh/director/nats_client_cert_generator_spec.rb
@@ -102,7 +102,7 @@ module Director
 
           expect { subject }.to raise_error(DeploymentNATSClientCertificateGenerationError) do |error|
             expect(error.message).to include('Error occurred while loading private key to generate NATS Client certificates')
-            expect(error.message).to include('OpenSSL::PKey::RSAError: Neither PUB key nor PRIV key')
+            expect(error.message).to include('Neither PUB key nor PRIV key')
           end
         end