diff --git a/security/keymint/aidl/vts/functional/AttestKeyTest.cpp b/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
index 0f73cfd53b..881354d41d 100644
--- a/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
+++ b/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
@@ -56,6 +56,7 @@ TEST_P(AttestKeyTest, AllRsaSizes) {
                                              {} /* attestation signing key */, &attest_key.keyBlob,
                                              &attest_key_characteristics, &attest_key_cert_chain));
 
+        ASSERT_GT(attest_key_cert_chain.size(), 0);
         EXPECT_EQ(attest_key_cert_chain.size(), 1);
         EXPECT_TRUE(IsSelfSigned(attest_key_cert_chain)) << "Failed on size " << size;
 
@@ -549,6 +550,7 @@ TEST_P(AttestKeyTest, AllEcCurves) {
                                              {} /* attestation siging key */, &attest_key.keyBlob,
                                              &attest_key_characteristics, &attest_key_cert_chain));
 
+        ASSERT_GT(attest_key_cert_chain.size(), 0);
         EXPECT_EQ(attest_key_cert_chain.size(), 1);
         EXPECT_TRUE(IsSelfSigned(attest_key_cert_chain)) << "Failed on curve " << curve;
 
@@ -632,6 +634,7 @@ TEST_P(AttestKeyTest, AttestWithNonAttestKey) {
                     {} /* attestation siging key */, &non_attest_key.keyBlob,
                     &non_attest_key_characteristics, &non_attest_key_cert_chain));
 
+    ASSERT_GT(non_attest_key_cert_chain.size(), 0);
     EXPECT_EQ(non_attest_key_cert_chain.size(), 1);
     EXPECT_TRUE(IsSelfSigned(non_attest_key_cert_chain));
 
diff --git a/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp b/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp
index 7009c6ef14..7ed696877d 100644
--- a/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp
+++ b/security/keymint/aidl/vts/functional/DeviceUniqueAttestationTest.cpp
@@ -76,7 +76,7 @@ TEST_P(DeviceUniqueAttestationTest, RsaNonStrongBoxUnimplemented) {
                                       .Authorization(TAG_DEVICE_UNIQUE_ATTESTATION),
                               &key_blob, &key_characteristics);
 
-    ASSERT_TRUE(result == ErrorCode::UNSUPPORTED_TAG);
+    ASSERT_EQ(result, ErrorCode::INVALID_ARGUMENT);
 }
 
 /*
@@ -102,7 +102,7 @@ TEST_P(DeviceUniqueAttestationTest, EcdsaNonStrongBoxUnimplemented) {
                                       .Authorization(TAG_DEVICE_UNIQUE_ATTESTATION),
                               &key_blob, &key_characteristics);
 
-    ASSERT_TRUE(result == ErrorCode::UNSUPPORTED_TAG);
+    ASSERT_EQ(result, ErrorCode::INVALID_ARGUMENT);
 }
 
 /*