diff --git a/header.go b/header.go
index fa83a93..0dc7995 100644
--- a/header.go
+++ b/header.go
@@ -164,7 +164,7 @@ func (h *header) SendIsTerminalSizeEnough(isEnough bool) {
 func (h *header) calculateTitleLength() {
 	var titleLen int
 	for _, hdr := range h.headers {
-		titleLen += len(hdr.title)
+		titleLen += len([]rune(hdr.title))
 		titleLen += h.properties.leftTabPadding + h.properties.rightTabPadding
 		titleLen += 2 // for the border between titles
 	}
diff --git a/widget.go b/widget.go
index 63c59e0..1690fd6 100644
--- a/widget.go
+++ b/widget.go
@@ -223,7 +223,7 @@ func (w *widget) Update(msg tea.Msg) (*widget, tea.Cmd) {
 func (w *widget) calculateWidgetLength() {
 	var widgetLen int
 	for _, widget := range w.widgets {
-		widgetLen += len(widget.Value)
+		widgetLen += len([]rune(widget.Value))
 		widgetLen += w.properties.leftTabPadding + w.properties.rightTabPadding
 		widgetLen += 2 // for the border between widgets
 	}