diff --git a/Dockerfile b/Dockerfile
index 877da4745..467df67f1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@ ARG ARCH="amd64"
 ARG OS="linux"
 FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
 
-ADD operator /bin/operator
+COPY operator /bin/operator
 
 # On busybox 'nobody' has uid `65534'
 USER 65534
diff --git a/cmd/admission-webhook/Dockerfile b/cmd/admission-webhook/Dockerfile
index ebaa0b4d2..613dc084e 100644
--- a/cmd/admission-webhook/Dockerfile
+++ b/cmd/admission-webhook/Dockerfile
@@ -2,7 +2,7 @@ ARG ARCH="amd64"
 ARG OS="linux"
 FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
 
-ADD admission-webhook /bin/admission-webhook
+COPY admission-webhook /bin/admission-webhook
 
 USER nobody
 
diff --git a/cmd/prometheus-config-reloader/Dockerfile b/cmd/prometheus-config-reloader/Dockerfile
index 2e948727c..0e5e367d2 100644
--- a/cmd/prometheus-config-reloader/Dockerfile
+++ b/cmd/prometheus-config-reloader/Dockerfile
@@ -2,7 +2,7 @@ ARG ARCH="amd64"
 ARG OS="linux"
 FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
 
-ADD prometheus-config-reloader /bin/prometheus-config-reloader
+COPY prometheus-config-reloader /bin/prometheus-config-reloader
 
 USER nobody
 
diff --git a/example/alertmanger-webhook/Dockerfile b/example/alertmanger-webhook/Dockerfile
index 7415db13a..180cde804 100644
--- a/example/alertmanger-webhook/Dockerfile
+++ b/example/alertmanger-webhook/Dockerfile
@@ -1,5 +1,5 @@
 FROM quay.io/prometheus/busybox:latest
 
-ADD main /bin/main
+COPY main /bin/main
 
 ENTRYPOINT ["/bin/main"]