diff --git a/Keystore.h b/Keystore.h
index d8c488e..a9dd7aa 100644
--- a/Keystore.h
+++ b/Keystore.h
@@ -113,7 +113,7 @@
     // Generate a key using keystore2 from the given params.
     bool generateKey(const km::AuthorizationSet& inParams, std::string* key);
     // Exports a keystore2 key with STORAGE_KEY tag wrapped with a per-boot ephemeral key
-    bool exportKey(const KeyBuffer& ksKey, std::string* key);
+    km::ErrorCode exportKey(const KeyBuffer& ksKey, std::string* key);
     // If supported, permanently delete a key from the keymint device it belongs to.
     bool deleteKey(const std::string& key);
     // Begin a new cryptographic operation, collecting output parameters if pointer is non-null