diff --git a/scrollbar.go b/scrollbar.go
index 1366342..4cb5ed2 100644
--- a/scrollbar.go
+++ b/scrollbar.go
@@ -335,12 +335,12 @@ func (this scrollbarLayout) Arrange (hints tomo.LayoutHints, boxes []tomo.Box) {
 	
 }
 
-func (this scrollbarLayout) RecommendedHeight (tomo.LayoutHints, []tomo.Box, int) int {
-	return 0
+func (this scrollbarLayout) RecommendedHeight (hints tomo.LayoutHints, boxes []tomo.Box, width int) int {
+	return this.MinimumSize(hints, boxes).X
 }
 
-func (this scrollbarLayout) RecommendedWidth (tomo.LayoutHints, []tomo.Box, int) int {
-	return 0
+func (this scrollbarLayout) RecommendedWidth (hints tomo.LayoutHints, boxes []tomo.Box, height int) int {
+	return this.MinimumSize(hints, boxes).Y
 }
 
 func (this scrollbarLayout) viewportContentRatio () float64 {
diff --git a/scrollcontainer.go b/scrollcontainer.go
index 9659acc..e4b18e4 100644
--- a/scrollcontainer.go
+++ b/scrollcontainer.go
@@ -184,12 +184,12 @@ func (this *scrollContainerLayout) Arrange (hints tomo.LayoutHints, boxes []tomo
 	}
 }
 
-func (this *scrollContainerLayout) RecommendedHeight (tomo.LayoutHints, []tomo.Box, int) int {
-	return 0
+func (this *scrollContainerLayout) RecommendedHeight (hints tomo.LayoutHints, boxes []tomo.Box, width int) int {
+	return this.MinimumSize(hints, boxes).X
 }
 
-func (this *scrollContainerLayout) RecommendedWidth (tomo.LayoutHints, []tomo.Box, int) int {
-	return 0
+func (this *scrollContainerLayout) RecommendedWidth (hints tomo.LayoutHints, boxes []tomo.Box, height int) int {
+	return this.MinimumSize(hints, boxes).Y
 }
 
 func max (x, y int) int {