diff --git a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
index cb27efc5..0141bb64 100644
--- a/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
+++ b/libwvdrmengine/oemcrypto/test/oemcrypto_test.cpp
@@ -1340,6 +1340,8 @@ TEST_F(OEMCryptoProv40Test, GenerateCertificateKeyPairSuccess) {
   } else if (key_type == OEMCrypto_PrivateKeyType::OEMCrypto_ECC_Private_Key) {
     ASSERT_NO_FATAL_FAILURE(
         s.SetEcPublicKey(public_key.data(), public_key_size));
+  } else {
+    FAIL() << "Unknown private key type: " << static_cast<int>(key_type);
   }
 }