diff --git a/runtime/lua/vim/secure.lua b/runtime/lua/vim/secure.lua
index e5d567ba0c..a2884f84dc 100644
--- a/runtime/lua/vim/secure.lua
+++ b/runtime/lua/vim/secure.lua
@@ -47,7 +47,7 @@ local function compute_hash(fullpath, bufnr)
     end
   else
     do
-      local f = io.open(fullpath, 'r')
+      local f = io.open(fullpath, 'rb')
       if not f then
         return nil, nil
       end