diff --git a/src/main/asciidoc/reference/mongo-repositories.adoc b/src/main/asciidoc/reference/mongo-repositories.adoc
index a7a6b1ed2..3255764af 100644
--- a/src/main/asciidoc/reference/mongo-repositories.adoc
+++ b/src/main/asciidoc/reference/mongo-repositories.adoc
@@ -34,7 +34,7 @@ Note that the domain type shown in the preceding example has a property named `i
 ====
 [source]
 ----
-public interface PersonRepository extends PagingAndSortingRepository<Person, Long> {
+public interface PersonRepository extends PagingAndSortingRepository<Person, String> {
 
   // additional custom query methods go here
 }