diff --git a/.config/nvim/init.vim b/.config/nvim/init.vim
index b551caa..180a357 100644
--- a/.config/nvim/init.vim
+++ b/.config/nvim/init.vim
@@ -77,7 +77,7 @@ endif
 " enable persistent undo
 if has('persistent_undo')
     set undofile
-    set undodir=$XDG_CACHE_HOME/vim/undo
+    set undodir="$XDG_CACHE_HOME/vim/undo"
 endif
 
 " unmap unwanted commands