diff --git a/vertices.go b/vertices.go
index 8635d1d82..87658bab4 100644
--- a/vertices.go
+++ b/vertices.go
@@ -90,7 +90,7 @@ func vertices(sx0, sy0, sx1, sy1 int, width, height int, geo *affine.GeoM) []flo
 	// Adjust texels to be slightly inside the source rect. Without this
 	// adjustment, texels can be exactly as same values as the edges'
 	// positions and it could happen that nothing is rendered. (#491)
-	const minHighpValue = 1.0/32768.0
+	const minHighpValue = 1.0 / 32768.0
 	u0 += minHighpValue
 	v0 += minHighpValue
 	u1 -= minHighpValue