diff --git a/hw/xfree86/modes/xf86EdidModes.c b/hw/xfree86/modes/xf86EdidModes.c
index 92eb196de..54f2c6570 100644
--- a/hw/xfree86/modes/xf86EdidModes.c
+++ b/hw/xfree86/modes/xf86EdidModes.c
@@ -170,6 +170,11 @@ static Bool quirk_detailed_use_maximum_size (int scrnIndex, xf86MonPtr DDC)
 	(DDC->vendor.prod_id == 0 || DDC->vendor.prod_id == 0x2a00))
 	return TRUE;
 
+    /* Bug #21324: Iiyama Vision Master 450 */
+    if (memcmp (DDC->vendor.name, "IVM", 4) == 0 &&
+	DDC->vendor.prod_id == 6400)
+	return TRUE;
+
     return FALSE;
 }