diff --git a/autoload/lsp/internal/diagnostics/float.vim b/autoload/lsp/internal/diagnostics/float.vim
index f7f40a158..b829e47f2 100644
--- a/autoload/lsp/internal/diagnostics/float.vim
+++ b/autoload/lsp/internal/diagnostics/float.vim
@@ -104,6 +104,8 @@ function! s:get_doc_win() abort
     call setbufvar(s:doc_win.get_bufnr(), '&bufhidden', 'hide')
     call setbufvar(s:doc_win.get_bufnr(), '&buflisted', 0)
     call setbufvar(s:doc_win.get_bufnr(), '&swapfile', 0)
+    call setbufvar(s:doc_win.get_bufnr(), '&modifiable', 1)
+    call setbufvar(s:doc_win.get_bufnr(), '&readonly', 0)
     return s:doc_win
 endfunction
 
diff --git a/autoload/lsp/internal/document_hover/under_cursor.vim b/autoload/lsp/internal/document_hover/under_cursor.vim
index 458ad6b16..c9348983b 100644
--- a/autoload/lsp/internal/document_hover/under_cursor.vim
+++ b/autoload/lsp/internal/document_hover/under_cursor.vim
@@ -118,6 +118,8 @@ function! s:show_preview_window(server_name, request, response) abort
     setlocal nobuflisted
     setlocal buftype=nofile
     setlocal noswapfile
+    setlocal noreadonly
+    setlocal modifiable
     %d _
     call setline(1, l:lines)
     call s:Window.do(win_getid(), {->s:Markdown.apply()})