diff --git a/runtime/lua/vim/lsp/diagnostic.lua b/runtime/lua/vim/lsp/diagnostic.lua
index c83e29aa64..1342df529f 100644
--- a/runtime/lua/vim/lsp/diagnostic.lua
+++ b/runtime/lua/vim/lsp/diagnostic.lua
@@ -1211,7 +1211,7 @@ function M.show_line_diagnostics(opts, bufnr, line_nr, client_id)
     table.insert(lines, prefix..message_lines[1])
     table.insert(highlights, {#prefix, hiname})
     for j = 2, #message_lines do
-      table.insert(lines, message_lines[j])
+      table.insert(lines, string.rep(' ', #prefix) .. message_lines[j])
       table.insert(highlights, {0, hiname})
     end
   end