Index: firmware/App/Modes/Dialysis.c
===================================================================
diff -u -rb87b0135945e60e11688b7f2002839023f30b588 -re64816def7cd98e7dcb6d133b3a56c9fea835af3
--- firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision b87b0135945e60e11688b7f2002839023f30b588)
+++ firmware/App/Modes/Dialysis.c	(.../Dialysis.c)	(revision e64816def7cd98e7dcb6d133b3a56c9fea835af3)
@@ -15,6 +15,8 @@
 *
 ***************************************************************************/
 
+#include <math.h>       // Using fabs() function
+
 #include "AirTrap.h"
 #include "BloodFlow.h"
 #include "Buttons.h"