diff --git a/jenkins/cloudbees_build b/jenkins/cloudbees_build
index b835df5..3544b46 100644
--- a/jenkins/cloudbees_build
+++ b/jenkins/cloudbees_build
@@ -12,10 +12,10 @@
 ###########################################
 # Determine EPICS Base version
 
-DEFAULT_BASE=3.14.12.5
+DEFAULT_BASE=3.15.4
 
-BASE=${1:-${DEFAULT_BASE}}
-USE_MB=${2:-"MB_NO"}
+BASE=${BASE:-${DEFAULT_BASE}}
+MICROBENCH=${MICROBENCH:-"NO_MICROBENCH"}
 
 ###########################################
 # Fetch and unpack dependencies