diff --git a/.env b/.env
index d6a25a9..e9789b7 100644
--- a/.env
+++ b/.env
@@ -1,5 +1,11 @@
+# Serial device
 SERIAL_DEV="/dev/cu.usbserial-A700e0gN"
 #SERIAL_DEV="/dev/ttyUSB0"
-SERIAL_SPEED = 9600
-#SERIAL_SPEED = 19200
-#SERIAL_SPEED = 115200
+
+# Serial baud rate
+SERIAL_SPEED=9600
+#SERIAL_SPEED=19200
+#SERIAL_SPEED=115200
+
+# FIFO filename
+FIFO="/tmp/mapid"
diff --git a/fifo_bridge.py b/fifo_bridge.py
index c78780d..7bb3703 100755
--- a/fifo_bridge.py
+++ b/fifo_bridge.py
@@ -7,7 +7,8 @@ import mapid
 from serial.serialutil import SerialException
 
 
-FIFO = "/tmp/mapid"
+mapid.load_dotenv()
+FIFO = return os.environ.get("FIFO")
 
 
 def main():