diff --git a/hw/display/edid-generate.c b/hw/display/edid-generate.c
index 75c945a948..e58472fde5 100644
--- a/hw/display/edid-generate.c
+++ b/hw/display/edid-generate.c
@@ -360,8 +360,8 @@ void qemu_edid_generate(uint8_t *edid, size_t size,
     edid[20] = 0xa5;
 
     /* screen size: undefined */
-    edid[21] = info->prefx * info->dpi / 2540;
-    edid[22] = info->prefy * info->dpi / 2540;
+    edid[21] = info->prefx * 254 / 100 / info->dpi;
+    edid[22] = info->prefy * 254 / 100 / info->dpi;
 
     /* display gamma: 2.2 */
     edid[23] = 220 - 100;