diff --git a/mise.toml b/mise.toml
index 20fa897..cf88626 100644
--- a/mise.toml
+++ b/mise.toml
@@ -42,6 +42,10 @@ arduino-cli compile --fqbn "$FQBN" --libraries ./libraries $LIBS --build-propert
 [tasks.upload]
 description = "Upload (uses BOARD env var)"
 run = """
+# Kill any screen session holding the port
+screen -X -S doorbell quit 2>/dev/null || true
+sleep 1
+
 case "$BOARD" in
   esp32-32e) PORT="${PORT:-/dev/ttyUSB0}" ;;
   esp32-32e-4) PORT="${PORT:-/dev/ttyUSB0}" ;;