diff --git a/docker-compose.yml b/docker-compose.yml
index e9fb547..2b2aa30 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -53,9 +53,9 @@ services:
       platforms:
         - linux/arm64
       args:
-        # WebSocket URL of the GStreamer signaling server, baked into the frontend bundle.
-        # Override with: VITE_WEBRTC_WS_URL=ws://raspberrypi.local:8443
-        VITE_WEBRTC_WS_URL: ${VITE_WEBRTC_WS_URL:-}
+        # Hostname of the GStreamer signaling server, baked into the frontend bundle.
+        # Override with: VITE_WEBRTC_HOST=raspbot-v2.local
+        VITE_WEBRTC_HOST: ${VITE_WEBRTC_HOST:-}
     image: raspbot_v2_webui:latest
     network_mode: host
     ipc: host
diff --git a/webui/Dockerfile b/webui/Dockerfile
index e0acfd9..62e59b6 100644
--- a/webui/Dockerfile
+++ b/webui/Dockerfile
@@ -6,10 +6,10 @@ COPY frontend/package.json ./
 RUN npm install
 COPY frontend/ ./
 
-# Passed in via docker-compose build args so the URL is baked into the bundle.
-# e.g. VITE_WEBRTC_WS_URL=ws://raspberrypi.local:8443
-ARG VITE_WEBRTC_WS_URL
-ENV VITE_WEBRTC_WS_URL=${VITE_WEBRTC_WS_URL}
+# Passed in via docker-compose build args so the host is baked into the bundle.
+# e.g. VITE_WEBRTC_HOST=raspbot-v2.local
+ARG VITE_WEBRTC_HOST
+ENV VITE_WEBRTC_HOST=${VITE_WEBRTC_HOST}
 
 RUN npm run build