diff --git a/Makefile b/Makefile
index 3478b0f..b205054 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,7 @@
 include $(MAKEDIR)/include.mk
 
 VENV_DIR      ?= venv-jjb
+JJB_VERSION   ?= 2.8.0
 # JJB_VERSION   ?= 4.1.0
 JOBCONFIG_DIR ?= job-configs
 
diff --git a/jjb/maven.yaml b/jjb/maven.yaml
index fc44abf..00bb08e 100644
--- a/jjb/maven.yaml
+++ b/jjb/maven.yaml
@@ -120,8 +120,8 @@
     wrappers:
       - credentials-binding:
           - file:
-            credential-id: 'gpg-creds-maven'
-            variable: 'GNUPG'
+              credential-id: 'gpg-creds-maven'
+              variable: 'GNUPG'
 
     builders:
       # Set JDK version