diff --git a/rpitx.py b/rpitx.py
index 8754e9cb..96adeddc 100644
--- a/rpitx.py
+++ b/rpitx.py
@@ -12,6 +12,7 @@ from PIL import Image, ImageDraw, ImageFont, ImageColor
 
 def battery_saver_check():
 	try:
+		global txc
 		f = open("/home/pi/CubeSatSim/battery_saver")
 		f.close()
 		txc = False