diff --git a/cubesatsim/cubesatsim.h b/cubesatsim/cubesatsim.h
index 024d3a2a..5d890ff0 100644
--- a/cubesatsim/cubesatsim.h
+++ b/cubesatsim/cubesatsim.h
@@ -328,6 +328,7 @@ int ready = FALSE;
 bool cw_stop = false;
 int payload_command = false;
 bool debug_mode = false;
+bool voltage_read = false;
 
 #define PRESSED 0
 #define HELD 0