diff --git a/autoload/vimtex/context/cite.vim b/autoload/vimtex/context/cite.vim
index 63a265d6d4..7be33114da 100644
--- a/autoload/vimtex/context/cite.vim
+++ b/autoload/vimtex/context/cite.vim
@@ -212,7 +212,7 @@ endfunction
 
 " }}}1
 function! s:actions.open_bdsk() abort dict " {{{1
-  call vimtex#util#www('x-bdsk://' .. self.entry.key)
+  call vimtex#util#www('x-bdsk://' .. vimtex#util#url_encode(self.entry.key))
 endfunction
 
 " }}}1
diff --git a/autoload/vimtex/util.vim b/autoload/vimtex/util.vim
index ba4e544117..c258927339 100644
--- a/autoload/vimtex/util.vim
+++ b/autoload/vimtex/util.vim
@@ -483,6 +483,18 @@ function! vimtex#util#undostore() abort " {{{1
   endif
 endfunction
 
+" }}}1
+function! vimtex#util#url_encode(str) abort " {{{1
+  " This code is based on Tip Pope's vim-unimpaired:
+  " https://github.com/tpope/vim-unimpaired
+  return substitute(
+        \ iconv(a:str, 'latin1', 'utf-8'),
+        \ '[^A-Za-z0-9_.~-]',
+        \ '\="%".printf("%02X",char2nr(submatch(0)))',
+        \ 'g'
+        \)
+endfunction
+
 " }}}1
 function! vimtex#util#www(url) abort " {{{1
   let l:cmd = get(#{