diff --git a/ts/00_commitinfo_data.ts b/ts/00_commitinfo_data.ts
index d9b95a5..28d51dc 100644
--- a/ts/00_commitinfo_data.ts
+++ b/ts/00_commitinfo_data.ts
@@ -3,6 +3,6 @@
  */
 export const commitinfo = {
   name: '@shipzone/npmci',
-  version: '4.1.1',
+  version: '4.1.2',
   description: 'node and docker in gitlab ci on steroids'
 }
diff --git a/ts/manager.docker/mod.classes.dockerfile.ts b/ts/manager.docker/mod.classes.dockerfile.ts
index d07c33e..cf20865 100644
--- a/ts/manager.docker/mod.classes.dockerfile.ts
+++ b/ts/manager.docker/mod.classes.dockerfile.ts
@@ -177,14 +177,14 @@ export class Dockerfile {
   ): Promise<string> {
     logger.log('info', 'checking for env vars to be supplied to the docker build');
     let buildArgsString: string = '';
-    for (const key of Object.keys(
+    for (const dockerArgKey of Object.keys(
       npmciDockerManagerRef.npmciRef.npmciConfig.getConfig().dockerBuildargEnvMap
     )) {
-      const targetValue =
-        process.env[
-          npmciDockerManagerRef.npmciRef.npmciConfig.getConfig().dockerBuildargEnvMap[key]
-        ];
-      buildArgsString = `${buildArgsString} --build-arg ${key}="${targetValue}"`;
+      const dockerArgOuterEnvVar =
+        npmciDockerManagerRef.npmciRef.npmciConfig.getConfig().dockerBuildargEnvMap[dockerArgKey];
+      logger.log('note', `docker ARG "${dockerArgKey}" maps to outer env var "${dockerArgOuterEnvVar}"`);
+      const targetValue = process.env[dockerArgOuterEnvVar];
+      buildArgsString = `${buildArgsString} --build-arg ${dockerArgKey}="${targetValue}"`;
     }
     return buildArgsString;
   }