diff --git a/Jenkinsfile b/Jenkinsfile
index 89568d0..bc5cc9e 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -1,6 +1,6 @@
-def imageName = "jdk14-alpine"
-def releaseTagPrefix = "release-"
-def registryHost = "git.tswf.io"
+static def imageName = "jdk14-alpine"
+static def releaseTagPrefix = "release-"
+static def registryHost = "git.tswf.io"
 
 def resolveImageTag(env) {
     return env.TAG_NAME?.replace(releaseTagPrefix, '') ?: 'latest'