diff -r b73490398368 -r 8c7d87a2c094 thermferm/thermferm.h
--- a/thermferm/thermferm.h	Sun Aug 03 22:49:33 2014 +0200
+++ b/thermferm/thermferm.h	Mon Aug 04 15:18:29 2014 +0200
@@ -91,6 +91,7 @@
     time_t		prof_started;		/* Profile start time		*/
     int			prof_state;		/* Profile OFF|PAUSE|RUN|DONE	*/
     float		prof_target;		/* Profile current target temp	*/
+    float		PID_err_old;		/* PID old error value		*/
 } units_list;
 
 #define	UNITMODE_OFF		0		/* Unit turned off		*/