diff --git a/autoload/ale/floating_preview.vim b/autoload/ale/floating_preview.vim
index 970a9b30..3e1fabb8 100644
--- a/autoload/ale/floating_preview.vim
+++ b/autoload/ale/floating_preview.vim
@@ -21,6 +21,8 @@ function! ale#floating_preview#Show(lines, ...) abort
     else
         call s:VimShow(a:lines, l:options)
     endif
+
+    return w:preview.id
 endfunction
 
 function! s:NvimShow(lines, options) abort
diff --git a/test/test_floating_preview.vader b/test/test_floating_preview.vader
index 43415556..f765f3f8 100644
--- a/test/test_floating_preview.vader
+++ b/test/test_floating_preview.vader
@@ -12,6 +12,7 @@ Before:
   function! ale#floating_preview#Show(lines, ...) abort
     let g:floating_preview_show_called = 1
     let g:floated_lines = a:lines
+    return win_getid()
   endfunction
 
   let g:ale_buffer_info = {
diff --git a/test/test_hover.vader b/test/test_hover.vader
index 580b8846..db302585 100644
--- a/test/test_hover.vader
+++ b/test/test_hover.vader
@@ -25,6 +25,7 @@ Before:
   function! ale#floating_preview#Show(lines, ...) abort
     let g:floating_preview_show_called = 1
     let g:floated_lines = a:lines
+    return win_getid()
   endfunction
 
   function! ale#lsp_linter#StartLSP(buffer, linter, callback) abort