diff --git a/src/dodb/index.cr b/src/dodb/index.cr
index b6e8c79..54fbdb1 100644
--- a/src/dodb/index.cr
+++ b/src/dodb/index.cr
@@ -114,7 +114,7 @@ class DODB::Index(V) < DODB::Indexer(V)
 	end
 
 	def update(index : String, new_value : V)
-		_, key = get_with_key index
+		key = get_key_on_fs index
 
 		@storage[key] = new_value
 	end