diff --git a/docker/acc-server/entrypoint.sh b/docker/acc-server/entrypoint.sh
index 67d6e1b..1724369 100644
--- a/docker/acc-server/entrypoint.sh
+++ b/docker/acc-server/entrypoint.sh
@@ -6,10 +6,18 @@ set -e
 DISPLAY_NUM=$((SERVER_PORT % 1000 + 100))
 export DISPLAY=:${DISPLAY_NUM}
 
+# Wine Staging looks for PulseAudio via XDG_RUNTIME_DIR. There is no audio
+# in this container, so point it at a valid (empty) directory to silence
+# the "XDG_RUNTIME_DIR is invalid" errors.
+export XDG_RUNTIME_DIR=/tmp/runtime-${SERVER_PORT}
+mkdir -p "${XDG_RUNTIME_DIR}"
+
 # Clean up any stale X lock from a previous container run.
 rm -f /tmp/.X${DISPLAY_NUM}-lock /tmp/.X11-unix/X${DISPLAY_NUM} 2>/dev/null || true
 
-Xvfb ${DISPLAY} -screen 0 1024x768x16 -nolisten tcp &
+# Raise Xvfb's client limit — Wine Staging opens more X11 connections than
+# the default 256, causing "Maximum number of clients reached" spam.
+Xvfb ${DISPLAY} -screen 0 1024x768x16 -nolisten tcp -maxclients 512 &
 XVFB_PID=$!
 
 cleanup() {