diff --git a/text/v2/gotext.go b/text/v2/gotext.go
index 3445538e6..c471aed12 100644
--- a/text/v2/gotext.go
+++ b/text/v2/gotext.go
@@ -179,7 +179,7 @@ func MustParseTag(str string) Tag {
 
 // Metrics implements Face.
 func (g *GoTextFace) Metrics() Metrics {
-	scale := float64(g.SizeInPoints) / float64(g.Source.f.Font.Upem())
+	scale := g.Source.scale(g.SizeInPoints)
 
 	var m Metrics
 	if h, ok := g.Source.f.FontHExtents(); ok {
diff --git a/text/v2/gotextfacesource.go b/text/v2/gotextfacesource.go
index 5047a8f1e..19f900aaa 100644
--- a/text/v2/gotextfacesource.go
+++ b/text/v2/gotextfacesource.go
@@ -178,7 +178,7 @@ func (g *GoTextFaceSource) shape(text string, face *GoTextFace) (shaping.Output,
 		}
 
 		scaledSegs := make([]api.Segment, len(segs))
-		scale := fixed26_6ToFloat32(out.Size) / float32(out.Face.Font.Upem())
+		scale := float32(g.scale(fixed26_6ToFloat64(out.Size)))
 		for i, seg := range segs {
 			scaledSegs[i] = seg
 			for j := range seg.Args {
@@ -214,3 +214,7 @@ func (g *GoTextFaceSource) shape(text string, face *GoTextFace) (shaping.Output,
 
 	return out, gs
 }
+
+func (g *GoTextFaceSource) scale(sizeInPoints float64) float64 {
+	return sizeInPoints / float64(g.f.Upem())
+}