diff --git a/keystore-engine/android_engine.cpp b/keystore-engine/android_engine.cpp
index ee16312..b368a3f 100644
--- a/keystore-engine/android_engine.cpp
+++ b/keystore-engine/android_engine.cpp
@@ -220,6 +220,7 @@
   RSA_FLAG_CACHE_PUBLIC | RSA_FLAG_OPAQUE | RSA_FLAG_EXT_PKEY,
 
   NULL /* keygen */,
+  NULL /* supports_digest */,
 };
 
 const char* ecdsa_get_key_id(const EC_KEY* ec_key) {