diff --git a/src/device/mouse.c b/src/device/mouse.c
index 93251531c..7a8291e63 100644
--- a/src/device/mouse.c
+++ b/src/device/mouse.c
@@ -471,7 +471,7 @@ mouse_subtract_z(int *delta_z, int min, int max, int invert)
         *delta_z = min;
         real_z += ABS(min);
     } else {
-        *delta_z = mouse_z;
+        *delta_z = real_z;
         real_z = 0;
     }
 
diff --git a/src/device/mouse_ps2.c b/src/device/mouse_ps2.c
index be8fd324f..35f0cd9e8 100644
--- a/src/device/mouse_ps2.c
+++ b/src/device/mouse_ps2.c
@@ -96,7 +96,6 @@ ps2_report_coordinates(atkbc_dev_t *dev, int main)
     kbc_at_dev_queue_add(dev, buff[1], main);
     kbc_at_dev_queue_add(dev, buff[2], main);
     if (dev->flags & FLAG_INTMODE) {
-        delta_z = -delta_z;
         delta_z &= 0x0f;
 
         if (dev->flags & FLAG_5BTN) {