diff --git a/vertices.go b/vertices.go
index d933407f9..dcf31bb99 100644
--- a/vertices.go
+++ b/vertices.go
@@ -18,4 +18,4 @@ package ebiten
 // Texels are adjusted by amount propotional to inverse of texelAdjustment.
 // This is necessary not to use unexpected pixels outside of texels.
 // See #317.
-const texelAdjustment = 128
+const texelAdjustment = 64