diff --git a/font/sfnt/sfnt.go b/font/sfnt/sfnt.go
index 0eb5cd5..e7125bf 100644
--- a/font/sfnt/sfnt.go
+++ b/font/sfnt/sfnt.go
@@ -1165,7 +1165,7 @@
 	Version uint32
 	// ItalicAngle in counter-clockwise degrees from the vertical. Zero for
 	// upright text, negative for text that leans to the right (forward).
-	ItalicAngle float32
+	ItalicAngle float64
 	// UnderlinePosition is the suggested distance of the top of the
 	// underline from the baseline (negative values indicate below baseline).
 	UnderlinePosition int16
@@ -1227,7 +1227,7 @@
 	}
 	post = &PostTable{
 		Version:            u,
-		ItalicAngle:        float32(int16(ang>>16)) + float32(ang&0xffff)/0x10000,
+		ItalicAngle:        float64(int32(ang)) / 0x10000,
 		UnderlinePosition:  int16(up),
 		UnderlineThickness: int16(ut),
 		IsFixedPitch:       fp != 0,