diff --git a/ui/vnc.c b/ui/vnc.c
index 7fc40ac..e04ebdf 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -1410,10 +1410,10 @@ static void pointer_event(VncState *vs, int button_mask,
         dz = 1;
 
     if (vs->absolute) {
-        kbd_mouse_event(ds_get_width(vs->ds) > 1 ?
-                          x * 0x7FFF / (ds_get_width(vs->ds) - 1) : 0x4000,
-                        ds_get_height(vs->ds) > 1 ?
-                          y * 0x7FFF / (ds_get_height(vs->ds) - 1) : 0x4000,
+        int width = ds_get_width(vs->ds);
+        int height = ds_get_height(vs->ds);
+        kbd_mouse_event(width > 1 ? x * 0x7FFF / (width - 1) : 0x4000,
+                        height > 1 ? y * 0x7FFF / (height - 1) : 0x4000,
                         dz, buttons);
     } else if (vnc_has_feature(vs, VNC_FEATURE_POINTER_TYPE_CHANGE)) {
         x -= 0x7FFF;