diff --git a/CryptCommandListener.cpp b/CryptCommandListener.cpp
index 09bc6c0..b6397f0 100644
--- a/CryptCommandListener.cpp
+++ b/CryptCommandListener.cpp
@@ -366,7 +366,9 @@
     } else if (cmd == "create_user_key" && argc > 4) {
         // create_user_key [user] [serial] [ephemeral]
         return sendGenericOkFail(cli,
-                e4crypt_create_user_key(atoi(argv[2]), atoi(argv[3]) != 0));
+                                 e4crypt_create_user_key(atoi(argv[2]),
+                                                         atoi(argv[3]),
+                                                         atoi(argv[4]) != 0));
 
     } else if (cmd == "destroy_user_key" && argc > 2) {
         // destroy_user_key [user]
diff --git a/Ext4Crypt.cpp b/Ext4Crypt.cpp
index 34f0a46..3f6fbdc 100644
--- a/Ext4Crypt.cpp
+++ b/Ext4Crypt.cpp
@@ -663,7 +663,7 @@
     return 0;
 }
 
-int e4crypt_create_user_key(userid_t user_id, bool ephemeral) {
+int e4crypt_create_user_key(userid_t user_id, int serial, bool ephemeral) {
     SLOGD("e4crypt_create_user_key(%d)", user_id);
     // TODO: create second key for user_de data
     if (e4crypt_get_key(
diff --git a/Ext4Crypt.h b/Ext4Crypt.h
index ed8bf28..a363d39 100644
--- a/Ext4Crypt.h
+++ b/Ext4Crypt.h
@@ -38,7 +38,7 @@
                       const char* value);
 int e4crypt_set_user_crypto_policies(const char *path);
 
-int e4crypt_create_user_key(userid_t user_id, bool ephemeral);
+int e4crypt_create_user_key(userid_t user_id, int serial, bool ephemeral);
 int e4crypt_destroy_user_key(userid_t user_id);
 
 int e4crypt_unlock_user_key(userid_t user_id, const char* token);