diff --git a/aspnet/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing/samples/sample17.cs b/aspnet/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing/samples/sample17.cs
index 93bcb936ca..b55eabf4ae 100644
--- a/aspnet/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing/samples/sample17.cs
+++ b/aspnet/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing/samples/sample17.cs
@@ -1,7 +1,7 @@
-[Route("~api/authors/{authorId}/books")]
+[Route("~/api/authors/{authorId:int}/books")]
 public IQueryable<BookDto> GetBooksByAuthor(int authorId)
 {
     return db.Books.Include(b => b.Author)
         .Where(b => b.AuthorId == authorId)
         .Select(AsBookDto);
-}
\ No newline at end of file
+}