Index: firmware/App/Controllers/AirTrap.c
===================================================================
diff -u -r356d40106ca38b590639ccb5ac903b066e1f8659 -rf1991666c75a50418876ef4b1c7aa282538ffe93
--- firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision 356d40106ca38b590639ccb5ac903b066e1f8659)
+++ firmware/App/Controllers/AirTrap.c	(.../AirTrap.c)	(revision f1991666c75a50418876ef4b1c7aa282538ffe93)
@@ -39,6 +39,7 @@
 
 /// Persistence period for illegal level sensors fault.
 static const U32 AIR_TRAP_ILLEGAL_LEVELS_PERSISTENCE = ( MS_PER_SECOND * 2 / TASK_GENERAL_INTERVAL );
+static const U32 AIR_TRAP_UPPER_LEVEL_PERSISTENCE = ( MS_PER_SECOND * 2 / TASK_GENERAL_INTERVAL );
 
 /// Volume (in mL) of venous portion of blood circuit line.  TODO - get actual volume from Systems.
 #define VENOUS_LINE_VOLUME_ML               ( 200.0F )