diff --git a/Jenkinsfile b/Jenkinsfile
index 6df6bd6..673c6c8 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -47,7 +47,7 @@ pipeline {
     success {
       sh """docker image prune -f"""
       sh """docker rmi -f \$(docker images -q $registry/$repo/$project:$version)"""
-      sh """for image in \$(grep FROM Dockerfile | cut -d ' ' -f 2 | grep -vi SCRATCH); do docker rmi -f \$(docker images -q \${image}); done"""
+      sh """for image in \$(grep FROM Dockerfile | cut -d ' ' -f 2 | grep -vi SCRATCH | uniq); do docker rmi -f \$(docker images -q \${image}); done"""
     }
     always {
       emailext body: 'build finished', subject: '[jenkins] docker '+project+'('+version+'): ' + currentBuild.result, to: 'cg@zknt.org', from: 'sysadm@zknt.org', attachLog: true