diff --git a/context.go b/context.go
index 427b183..c3b44f2 100644
--- a/context.go
+++ b/context.go
@@ -589,6 +589,7 @@ func (dc *Context) DrawImageAnchored(im image.Image, x, y int, ax, ay float64) {
 
 func (dc *Context) SetFontFace(fontFace font.Face) {
 	dc.fontFace = fontFace
+	dc.fontHeight = float64(fontFace.Metrics().Height) / 64
 }
 
 func (dc *Context) LoadFontFace(path string, points float64) error {