diff --git a/src/v_video.cpp b/src/v_video.cpp
index b69bba63f..c22402301 100644
--- a/src/v_video.cpp
+++ b/src/v_video.cpp
@@ -1739,7 +1739,7 @@ const int BaseRatioSizes[7][4] =
 	{ 1224, 471, 0,                   48*40/51 },	// 17:10  408,		156.8627, multiplied by three
 	{  960, 640, (int)(6.5*FRACUNIT), 48*15/16 },   //  5:4   320,      213.3333, multiplied by three
     { 1224, 471, 0,                   48*40/51 },	// 17:10  408,		156.8627, multiplied by three (REDUNDANT)
-    {  568, 113, 0,                   48*5/8 }      //  21:9
+    {  568, 113, 0,                   48*9/16 }     //  21:9
 };
 
 void IVideo::DumpAdapters ()