diff --git a/promtail/Dockerfile b/promtail/Dockerfile
index c7b6ed7..8c80bc8 100644
--- a/promtail/Dockerfile
+++ b/promtail/Dockerfile
@@ -13,9 +13,9 @@ RUN set -eux; \
     \
     apk add --no-cache --virtual .build-deps \
         tar \
-        ca-certificates \
         ; \
-    APKARCH="$(apk --print-arch)"; \
+RUN apk add --no-cache \
+        ca-certificates;
 RUN update-ca-certificates;
 RUN case "${BUILD_ARCH}" in \
         amd64)  BINARCH='amd64' ;; \