diff --git a/Dockerfile b/Dockerfile
index 34da2b2d8..95540e4ed 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM sitespeedio/webbrowsers:chrome-98.0-firefox-94.0-edge-97.0-multi
 
-ARG TARGETPLATFORM
+ARG TARGETPLATFORM=linux/amd64
 
 ENV SITESPEED_IO_BROWSERTIME__XVFB true
 ENV SITESPEED_IO_BROWSERTIME__DOCKER true
diff --git a/Dockerfile-slim b/Dockerfile-slim
index 015f8381e..233b700b2 100644
--- a/Dockerfile-slim
+++ b/Dockerfile-slim
@@ -1,6 +1,6 @@
 FROM node:16.13.2-bullseye-slim
 
-ARG TARGETPLATFORM
+ARG TARGETPLATFORM=linux/amd64
 
 ENV SITESPEED_IO_BROWSERTIME__DOCKER true
 ENV SITESPEED_IO_BROWSERTIME__VIDEO false