diff --git a/Dockerfile b/Dockerfile
index 5879257c5..7a4c9d5e0 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,9 +2,9 @@ FROM sitespeedio/webbrowsers:chrome-131.0-firefox-131.0-edge-130.0-b
 
 ARG TARGETPLATFORM=linux/amd64
 
-ENV BROWSERTIME_XVFB true
-ENV BROWSERTIME_CONNECTIVITY__ENGINE external
-ENV BROWSERTIME_DOCKER true
+ENV BROWSERTIME_XVFB=true
+ENV BROWSERTIME_CONNECTIVITY__ENGINE=external
+ENV BROWSERTIME_DOCKER=true
 
 COPY docker/webpagereplay/$TARGETPLATFORM/wpr /usr/local/bin/
 COPY docker/webpagereplay/wpr_cert.pem /webpagereplay/certs/