diff --git a/src/main/java/com/cloudbees/jenkins/plugins/docker_build_env/DockerBuildWrapper.java b/src/main/java/com/cloudbees/jenkins/plugins/docker_build_env/DockerBuildWrapper.java
index 567116e..35b4c79 100644
--- a/src/main/java/com/cloudbees/jenkins/plugins/docker_build_env/DockerBuildWrapper.java
+++ b/src/main/java/com/cloudbees/jenkins/plugins/docker_build_env/DockerBuildWrapper.java
@@ -228,6 +228,10 @@ private String whoAmI(Launcher launcher) throws IOException, InterruptedExceptio
         String uid = bos.toString().trim();
 
         String gid = group;
+        if (group.contains(":")){
+            //group contains user and group
+            return group;
+        }
         if (group == null) {
             ByteArrayOutputStream bos2 = new ByteArrayOutputStream();
             launcher.launch().cmds("id", "-g").stdout(bos2).quiet(true).join();