diff --git a/s3-lastmodified-checker/Dockerfile b/s3-lastmodified-checker/Dockerfile
index 959786f..cb8f583 100644
--- a/s3-lastmodified-checker/Dockerfile
+++ b/s3-lastmodified-checker/Dockerfile
@@ -4,7 +4,7 @@ RUN curl --version
 
 #RUN apt-get update && apt-get install -y curl
 
-ADD run.sh /opt/s3-lastmodified-checker/run.sh
+COPY run.sh /opt/s3-lastmodified-checker/run.sh
 
 WORKDIR /s3-lastmodified-checker