diff --git a/ci/Jenkinsfile.docker b/ci/Jenkinsfile.docker
index 60ea3633..0658364d 100644
--- a/ci/Jenkinsfile.docker
+++ b/ci/Jenkinsfile.docker
@@ -43,10 +43,9 @@ pipeline {
   stages {
     stage('Build') {
       steps { script {
-        def commitOrRef = params.GIT_REF ? params.GIT_REF.take(8) : GIT_COMMIT.take(8)
         image = docker.build(
-          "${params.IMAGE_NAME}:${params.IMAGE_TAG ?: commitOrRef}",
-          "--build-arg='GIT_COMMIT=${commitOrRef}' ."
+          "${params.IMAGE_NAME}:${params.IMAGE_TAG ?: GIT_COMMIT.take(8)}",
+          "--build-arg='GIT_COMMIT=${GIT_COMMIT.take(8)}' ."
         )
       } }
     }