diff --git a/pkg/cli/styles.go b/pkg/cli/styles.go
index 9ee9880..1e281d8 100644
--- a/pkg/cli/styles.go
+++ b/pkg/cli/styles.go
@@ -174,6 +174,13 @@ var borderSets = map[BorderStyle]borderSet{
 	BorderDouble:  {"╔", "╗", "╚", "╝", "═", "║", "╦", "╩", "╠", "╣", "╬"},
 }
 
+var borderSetsASCII = map[BorderStyle]borderSet{
+	BorderNormal:  {"+", "+", "+", "+", "-", "|", "+", "+", "+", "+", "+"},
+	BorderRounded: {"+", "+", "+", "+", "-", "|", "+", "+", "+", "+", "+"},
+	BorderHeavy:   {"+", "+", "+", "+", "=", "|", "+", "+", "+", "+", "+"},
+	BorderDouble:  {"+", "+", "+", "+", "=", "|", "+", "+", "+", "+", "+"},
+}
+
 // CellStyleFn returns a style based on the cell's raw value.
 // Return nil to use the table's default CellStyle.
 type CellStyleFn func(value string) *AnsiStyle
@@ -391,7 +398,7 @@ func (t *Table) renderPlain() string {
 }
 
 func (t *Table) renderBordered() string {
-	b := borderSets[t.borders]
+	b := tableBorderSet(t.borders)
 	widths := t.columnWidths()
 	cols := t.colCount()
 
@@ -472,3 +479,15 @@ func (t *Table) renderBordered() string {
 
 	return sb.String()
 }
+
+func tableBorderSet(style BorderStyle) borderSet {
+	if currentTheme == ThemeASCII {
+		if b, ok := borderSetsASCII[style]; ok {
+			return b
+		}
+	}
+	if b, ok := borderSets[style]; ok {
+		return b
+	}
+	return borderSet{}
+}
diff --git a/pkg/cli/styles_test.go b/pkg/cli/styles_test.go
index 8adae78..949c138 100644
--- a/pkg/cli/styles_test.go
+++ b/pkg/cli/styles_test.go
@@ -81,6 +81,22 @@ func TestTable_Good(t *testing.T) {
 		assert.Contains(t, out, "║")
 	})
 
+	t.Run("ASCII theme uses ASCII borders", func(t *testing.T) {
+		restoreThemeAndColors(t)
+		UseASCII()
+
+		tbl := NewTable("REPO", "STATUS").WithBorders(BorderRounded)
+		tbl.AddRow("core", "clean")
+
+		out := tbl.String()
+		assert.Contains(t, out, "+")
+		assert.Contains(t, out, "-")
+		assert.Contains(t, out, "|")
+		assert.NotContains(t, out, "╭")
+		assert.NotContains(t, out, "╮")
+		assert.NotContains(t, out, "│")
+	})
+
 	t.Run("bordered structure", func(t *testing.T) {
 		SetColorEnabled(false)
 		defer SetColorEnabled(true)