diff --git a/src/testdir/dumps/Test_popupwin_23.dump b/src/testdir/dumps/Test_popupwin_23.dump
new file mode 100644
index 0000000..737d8f1
--- /dev/null
+++ b/src/testdir/dumps/Test_popupwin_23.dump
@@ -0,0 +1,12 @@
+>1+0&#ffffff0| @73
+|2| |╔+0&#5fd7ff255|═@11|╗| +0&#ffffff0@5|╔+0&#dadada255|═@11|╗+0&#8a8a8a255| +0&#ffffff0@5|x+0&#5fd7ff255@13| +0&#ffffff0@2|#+0&#5fd7ff255|x@11|#| +0&#ffffff0@1
+|3| |║+0&#5fd7ff255|h+0#0000001#ffd7ff255|e|l@1|o| |b|o|r|d|e|r|║+0#0000000#5fd7ff255| +0&#ffffff0@5|║+0&#a8a8a8255|h+0#0000001#ffd7ff255|e|l@1|o| |b|o|r|d|e|r|║+0#0000000#8a8a8a255| +0&#ffffff0@5|x+0&#5fd7ff255|h+0#0000001#ffd7ff255|e|l@1|o| |b|o|r|d|e|r|x+0#0000000#5fd7ff255| +0&#ffffff0@2|x+0&#5fd7ff255|h+0#0000001#ffd7ff255|e|l@1|o| |b|o|r|d|e|r|x+0#0000000#5fd7ff255| +0&#ffffff0@1
+|4| |╚+0&#5fd7ff255|═@11|╝| +0&#ffffff0@5|║+0&#a8a8a8255|a+0#0000001#ffd7ff255|n|d| |m|o|r|e| @3|║+0#0000000#8a8a8a255| +0&#ffffff0@5|x+0&#5fd7ff255|l+0#0000001#ffd7ff255|i|n|e|s| |o|n|l|y| @1|x+0#0000000#5fd7ff255| +0&#ffffff0@2|x+0&#5fd7ff255|w+0#0000001#ffd7ff255|i|t|h| |c|o|r|n|e|r|s|x+0#0000000#5fd7ff255| +0&#ffffff0@1
+|5| @20|╚+0&#585858255|═@11|╝| +0&#ffffff0@5|x+0&#5fd7ff255@13| +0&#ffffff0@2|#+0&#5fd7ff255|x@11|#| +0&#ffffff0@1
+|6| |e+0&#5fd7ff255|a@11|f| +0&#ffffff0@58
+|7| |d+0&#5fd7ff255|h+0#0000001#ffd7ff255|e|l@1|o| |b|o|r|d|e|r|b+0#0000000#5fd7ff255| +0&#ffffff0@5| +0&#5fd7ff255@13| +0&#ffffff0@38
+|8| |d+0&#5fd7ff255|w+0#0000001#ffd7ff255|i|t|h| |n|u|m|b|e|r|s|b+0#0000000#5fd7ff255| +0&#ffffff0@5| +0&#5fd7ff255|h+0#0000001#ffd7ff255|e|l@1|o| |b|o|r|d|e|r| +0#0000000#5fd7ff255| +0&#ffffff0@38
+|9| |h+0&#5fd7ff255|c@11|g| +0&#ffffff0@5| +0&#5fd7ff255|j+0#0000001#ffd7ff255|u|s|t| |b|l|a|n|k|s| | +0#0000000#5fd7ff255| +0&#ffffff0@38
+|1|0| @19| +0&#5fd7ff255@13| +0&#ffffff0@38
+|1@1| @72
+@57|1|,|1| @10|T|o|p| 
diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index f16a46f..7d723a0 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -108,12 +108,16 @@
 	\ "call popup_create(['hello border', 'and more'], {'line': 2, 'col': 23, 'border': [], 'borderhighlight': ['TopColor', 'RightColor', 'BottomColor', 'LeftColor']})",
 	\ "call popup_create(['hello border', 'lines only'], {'line': 2, 'col': 43, 'border': [], 'borderhighlight': ['BlueColor'], 'borderchars': ['x']})",
 	\ "call popup_create(['hello border', 'with corners'], {'line': 2, 'col': 60, 'border': [], 'borderhighlight': ['BlueColor'], 'borderchars': ['x', '#']})",
-	\ "call popup_create(['hello border', 'with numbers'], {'line': 6, 'col': 3, 'border': [], 'borderhighlight': ['BlueColor'], 'borderchars': ['0', '1', '2', '3', '4', '5', '6', '7']})",
+	\ "let winid = popup_create(['hello border', 'with numbers'], {'line': 6, 'col': 3, 'border': [], 'borderhighlight': ['BlueColor'], 'borderchars': ['0', '1', '2', '3', '4', '5', '6', '7']})",
 	\ "call popup_create(['hello border', 'just blanks'], {'line': 7, 'col': 23, 'border': [], 'borderhighlight': ['BlueColor'], 'borderchars': [' ']})",
 	\], 'XtestPopupBorder')
   let buf = RunVimInTerminal('-S XtestPopupBorder', {'rows': 12})
   call VerifyScreenDump(buf, 'Test_popupwin_22', {})
 
+  " check that changing borderchars triggers a redraw
+  call term_sendkeys(buf, ":call popup_setoptions(winid, {'borderchars': ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h']})\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_23', {})
+
   call StopVimInTerminal(buf)
   call delete('XtestPopupBorder')