diff --git a/ui-tui/packages/hermes-ink/src/ink/selection.test.ts b/ui-tui/packages/hermes-ink/src/ink/selection.test.ts
index 0e0fba6573..83d77bf35d 100644
--- a/ui-tui/packages/hermes-ink/src/ink/selection.test.ts
+++ b/ui-tui/packages/hermes-ink/src/ink/selection.test.ts
@@ -55,6 +55,16 @@ describe('selection whitespace handling', () => {
     expect(getSelectedText(selection, screen)).toBe('  x')
   })
 
+  it('clamps copied selection bounds to screen width', () => {
+    const { screen } = screenWithText()
+    const selection = createSelectionState()
+
+    startSelection(selection, 0, 1)
+    updateSelection(selection, 99, 1)
+
+    expect(getSelectedText(selection, screen)).toBe('hi')
+  })
+
   it('does not paint selection background on leading/trailing empty cells or empty rows', () => {
     const { screen, styles } = screenWithText()
     const selection = createSelectionState()
diff --git a/ui-tui/packages/hermes-ink/src/ink/selection.ts b/ui-tui/packages/hermes-ink/src/ink/selection.ts
index 7c7505540b..76e776c22e 100644
--- a/ui-tui/packages/hermes-ink/src/ink/selection.ts
+++ b/ui-tui/packages/hermes-ink/src/ink/selection.ts
@@ -969,8 +969,8 @@ export function getSelectedText(s: SelectionState, screen: Screen): string {
   }
 
   for (let row = start.row; row <= end.row; row++) {
-    const rowStart = row === start.row ? start.col : 0
-    const rowEnd = row === end.row ? end.col : screen.width - 1
+    const rowStart = Math.max(0, row === start.row ? start.col : 0)
+    const rowEnd = Math.min(row === end.row ? end.col : screen.width - 1, screen.width - 1)
     const bounds = selectionContentBounds(screen, row, rowStart, rowEnd)
 
     joinRows(lines, bounds ? extractRowText(screen, row, bounds.first, bounds.last) : '', sw[row]! > 0)