diff --git a/keystore/java/android/security/keystore/AndroidKeyStoreKeyGeneratorSpi.java b/keystore/java/android/security/keystore/AndroidKeyStoreKeyGeneratorSpi.java
index 419eb24..953cef7d 100644
--- a/keystore/java/android/security/keystore/AndroidKeyStoreKeyGeneratorSpi.java
+++ b/keystore/java/android/security/keystore/AndroidKeyStoreKeyGeneratorSpi.java
@@ -301,6 +301,9 @@
                 KeyStoreCryptoOperationUtils.getRandomBytesToMixIntoKeystoreRng(
                         mRng, (mKeySizeBits + 7) / 8);
         int flags = 0;
+        if (spec.isStrongBoxBacked()) {
+            flags |= KeyStore.FLAG_STRONGBOX;
+        }
         String keyAliasInKeystore = Credentials.USER_PRIVATE_KEY + spec.getKeystoreAlias();
         KeyCharacteristics resultingKeyCharacteristics = new KeyCharacteristics();
         boolean success = false;
@@ -314,8 +317,12 @@
                     flags,
                     resultingKeyCharacteristics);
             if (errorCode != KeyStore.NO_ERROR) {
-                throw new ProviderException(
-                        "Keystore operation failed", KeyStore.getKeyStoreException(errorCode));
+                if (errorCode == KeyStore.HARDWARE_TYPE_UNAVAILABLE) {
+                    throw new StrongBoxUnavailableException("Failed to generate key");
+                } else {
+                    throw new ProviderException(
+                            "Keystore operation failed", KeyStore.getKeyStoreException(errorCode));
+                }
             }
             @KeyProperties.KeyAlgorithmEnum String keyAlgorithmJCA;
             try {