diff --git a/security/keymint/aidl/vts/functional/AttestKeyTest.cpp b/security/keymint/aidl/vts/functional/AttestKeyTest.cpp
index afb2193887..5cca560ef9 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;
 
@@ -494,6 +495,7 @@ 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;
 
@@ -577,6 +579,7 @@ 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));