diff --git a/cubesatsim/cubesatsim.h b/cubesatsim/cubesatsim.h
index 866d2d48..ad14e96a 100644
--- a/cubesatsim/cubesatsim.h
+++ b/cubesatsim/cubesatsim.h
@@ -151,5 +151,5 @@ const char pythonCmd[] = "python3 -u /home/pi/CubeSatSim/ina219.py ";
 char pythonStr[100], pythonConfigStr[100], busStr[10];
 int mapping[8] = {0, 1, 2, 3, 4, 5, 6, 7};
 char src_addr[5] = "";
-char dest_addr[5] = "APCSS";
+char dest_addr[6] = "APCSS";
 float voltage_min[9], current_min[9], voltage_max[9], current_max[9], sensor_max[17], sensor_min[17], other_max[3], other_min[3];