diff --git a/setter.go b/setter.go
index 06c671d..f487694 100644
--- a/setter.go
+++ b/setter.go
@@ -18,7 +18,7 @@ type TypeSetter struct {
 	face           font.Face
 	width, height  int
 	wrap           bool
-	tabWidth       int
+	tabWidth       fixed.Int26_6
 	
 	minWidth          fixed.Int26_6
 	layoutBounds      image.Rectangle
@@ -216,8 +216,8 @@ func (setter *TypeSetter) SetHeight (heignt int) {
 	setter.height = heignt
 }
 
-// SetTabWidth sets the distance between tab stops in em spaces.
-func (setter *TypeSetter) SetTabWidth (tabWidth int) {
+// SetTabWidth sets the distance between tab stops.
+func (setter *TypeSetter) SetTabWidth (tabWidth fixed.Int26_6) {
 	if setter.tabWidth == tabWidth { return }
 	setter.layoutClean = false
 	setter.alignClean  = false