diff --git a/touchpad.c b/touchpad.c
index 6f786f77..1d052fc3 100644
--- a/touchpad.c
+++ b/touchpad.c
@@ -1,7 +1,7 @@
 #include "touchpad.h"
 #include "glcd.h"
 
-static struct cal cal = {
+volatile static struct cal cal = {
 	1, 1, 0, 0
 };
 
diff --git a/touchpad.h b/touchpad.h
index 97efb09d..947077cc 100644
--- a/touchpad.h
+++ b/touchpad.h
@@ -9,7 +9,7 @@
 
 #define SET_CS(a)		(TP_PORT->BSRR = 1 << (TP_CS + (a ? 0 : 16)))
 
-volatile struct cal {
+struct cal {
 	float xm;
 	float ym;
 	float xn;