diff --git a/Dockerfile b/Dockerfile
index 9f6ef0c..de188d6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -39,6 +39,7 @@ RUN apt-get update \
         openbox \
         x11vnc \
         websockify \
+        autocutsel \
         wmctrl xdotool \
         dbus-x11 \
         pulseaudio pulseaudio-utils \
diff --git a/entrypoint.sh b/entrypoint.sh
index 253c54e..97ff6e0 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -260,6 +260,13 @@ as_app openbox &
 sleep 1
 as_app xsetroot -solid black
 
+# Mirror PRIMARY and CLIPBOARD selections. x11vnc's cut-text bridging and the
+# mix of Qt (CLIPBOARD) and CEF widgets inside OBS each favor one selection;
+# without a sync daemon a paste target can read the one that was never set,
+# which shows up as "clipboard randomly does nothing" in the viewer.
+as_app autocutsel -selection CLIPBOARD -fork
+as_app autocutsel -selection PRIMARY -fork
+
 cat > "$XDG/headless.pa" <<'PA'
 load-module module-native-protocol-unix
 load-module module-null-sink sink_name=obs_sink sink_properties=device.description=OBS_Output