diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6f88a91..0725b13 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2
 jobs:
     build:
         docker:
-        - image: andreacensi/duckuments:master
+        - image: andreacensi/mcdp_books:duckuments
         resource_class: large
         steps:
         - checkout
diff --git a/Makefile b/Makefile
index 2ab4e5b..4ecb683 100644
--- a/Makefile
+++ b/Makefile
@@ -1,11 +1,9 @@
 BASE:=book
-BOOKNAME:=`ls -1 $(BASE)`
+BOOKNAME:=`ls -1 $(BASE) | head -n 1`
 SRC:=book/$(BOOKNAME)
-
+IMAGE:=andreacensi/duckuments:devel
 
 all:
 	cat README.md
 
-
-
 include resources/makefiles/setup.Makefile