diff --git a/test/old/testdir/test_plugin_termdebug.vim b/test/old/testdir/test_plugin_termdebug.vim
index 6ff233fff0..bcc00a6e20 100644
--- a/test/old/testdir/test_plugin_termdebug.vim
+++ b/test/old/testdir/test_plugin_termdebug.vim
@@ -177,6 +177,65 @@ func Test_termdebug_basic()
   %bw!
 endfunc
 
+func Test_termdebug_decimal_breakpoints()
+  let bin_name = 'XTD_decimal'
+  let src_name = bin_name .. '.c'
+  call s:generate_files(bin_name)
+
+  exe "edit " .. src_name
+
+  let g:termdebug_config = {}
+  let g:termdebug_config['sign_decimal'] = 1
+
+  exe "Termdebug " .. bin_name
+  " Nvim: g:termdebug_is_running is not ported yet
+  " call WaitForAssert({-> assert_true(get(g:, "termdebug_is_running", v:false))})
+  call WaitForAssert({-> assert_equal(3, winnr('$'))})
+  let gdb_buf = winbufnr(1)
+  wincmd b
+  Break 9
+  call Nterm_wait(gdb_buf)
+  redraw!
+  Run
+  call Nterm_wait(gdb_buf, 400)
+
+  let i = 2
+  while i <= 258
+    Break
+    call Nterm_wait(gdb_buf)
+    if i == 2
+      call WaitForAssert({-> assert_equal(sign_getdefined('debugBreakpoint2.0')[0].text, '02')})
+    endif
+    if i == 10
+      call WaitForAssert({-> assert_equal(sign_getdefined('debugBreakpoint10.0')[0].text, '10')})
+    endif
+    if i == 168
+      call WaitForAssert({-> assert_equal(sign_getdefined('debugBreakpoint168.0')[0].text, '9+')})
+    endif
+    if i == 255
+      call WaitForAssert({-> assert_equal(sign_getdefined('debugBreakpoint255.0')[0].text, '9+')})
+    endif
+    if i == 256
+      call WaitForAssert({-> assert_equal(sign_getdefined('debugBreakpoint256.0')[0].text, '9+')})
+    endif
+    if i == 258
+      call WaitForAssert({-> assert_equal(sign_getdefined('debugBreakpoint258.0')[0].text, '9+')})
+    endif
+    let i += 1
+  endwhile
+
+  wincmd t
+  quit!
+  redraw!
+  call WaitForAssert({-> assert_equal(1, winnr('$'))})
+  call assert_equal([], sign_getplaced('', #{group: 'TermDebug'})[0].signs)
+
+  call s:cleanup_files(bin_name)
+  %bw!
+
+  unlet g:termdebug_config
+endfunc
+
 func Test_termdebug_tbreak()
   let g:test_is_flaky = 1
   let bin_name = 'XTD_tbreak'