diff --git a/lua/cmp/view/custom_entries_view.lua b/lua/cmp/view/custom_entries_view.lua
index bb3266f..a5eca58 100644
--- a/lua/cmp/view/custom_entries_view.lua
+++ b/lua/cmp/view/custom_entries_view.lua
@@ -37,6 +37,7 @@ custom_entries_view.new = function()
   -- from variable width of the tab character.
   self.entries_win:buffer_option('tabstop', 1)
   self.entries_win:buffer_option('filetype', 'cmp_menu')
+  self.entries_win:buffer_option('buftype', 'nofile')
   self.event = event.new()
   self.offset = -1
   self.active = false
diff --git a/lua/cmp/view/docs_view.lua b/lua/cmp/view/docs_view.lua
index 7db651b..e559a53 100644
--- a/lua/cmp/view/docs_view.lua
+++ b/lua/cmp/view/docs_view.lua
@@ -18,6 +18,7 @@ docs_view.new = function()
   self.window:option('showbreak', 'NONE')
   self.window:option('wrap', true)
   self.window:buffer_option('filetype', 'cmp_docs')
+  self.window:buffer_option('buftype', 'nofile')
   return self
 end