diff --git a/getting-started/protocols.markdown b/getting-started/protocols.markdown
index 340975f92..8a26f52c6 100644
--- a/getting-started/protocols.markdown
+++ b/getting-started/protocols.markdown
@@ -34,7 +34,7 @@ defimpl Utility, for: BitString do
 end
 
 defimpl Utility, for: Integer do
-  def mask(_value), do: "integer"
+  def type(_value), do: "integer"
 end
 ```