diff --git a/src/evdev-tablet.c b/src/evdev-tablet.c
index a63b734a..ff5f7373 100644
--- a/src/evdev-tablet.c
+++ b/src/evdev-tablet.c
@@ -106,7 +106,7 @@ tablet_update_tool(struct tablet_dispatch *tablet,
 static inline double
 normalize_pressure_or_dist(const struct input_absinfo * absinfo) {
 	double range = absinfo->maximum - absinfo->minimum + 1;
-	double value = (absinfo->value + absinfo->minimum) / range;
+	double value = (absinfo->value - absinfo->minimum) / range;
 
 	return value;
 }
@@ -114,7 +114,7 @@ normalize_pressure_or_dist(const struct input_absinfo * absinfo) {
 static inline double
 normalize_tilt(const struct input_absinfo * absinfo) {
 	double range = absinfo->maximum - absinfo->minimum + 1;
-	double value = (absinfo->value + absinfo->minimum) / range;
+	double value = (absinfo->value - absinfo->minimum) / range;
 
 	/* Map to the (-1, 1) range */
 	return (value * 2) - 1;