diff --git a/src/video_display/gl.cpp b/src/video_display/gl.cpp
index 9b6852889..ac5348a1b 100644
--- a/src/video_display/gl.cpp
+++ b/src/video_display/gl.cpp
@@ -196,7 +196,7 @@ void main(void) {
 
   // interpolate (0,1) texcoords to [0,719]
   int texcoordDenormX;
-  texcoordDenormX = int(gl_TexCoord[0].x * imageWidth - .5);
+  texcoordDenormX = int(gl_TexCoord[0].x * imageWidth - .4999);
 
   // 0 1 1 2 3 3 4 5 5 6 7 7 etc.
   int yOffset;