diff --git a/lib/inject.js b/lib/inject.js
index aced0fcf..876e1b75 100644
--- a/lib/inject.js
+++ b/lib/inject.js
@@ -67,7 +67,7 @@ function moveModuleUp(source, target, module) {
         file =>
           file.startsWith(module + '/') ||
           file.startsWith('serverless_sdk/') ||
-          file.match(/s_.*\.py/) !== null
+          file.match(/^s_.*\.py/) !== null
       )
     )
     .map(srcZipObj =>