diff --git a/pkgs/vim/default.nix b/pkgs/vim/default.nix
index 197fdd5..1cdd867 100755
--- a/pkgs/vim/default.nix
+++ b/pkgs/vim/default.nix
@@ -256,7 +256,7 @@ let
       augroup END
 
       " Neuron things
-      let g:neuron_extension = '.md'
+      let neuron_extension = '.md'
 
       " Extra options
       ${extraOptions}