diff --git a/autoload/nimrod.vim b/autoload/nimrod.vim
index 2782560..9d6e209 100644
--- a/autoload/nimrod.vim
+++ b/autoload/nimrod.vim
@@ -212,6 +212,9 @@ function! SyntaxCheckers_nimrod_nimrod_IsAvailable()
   return executable("nimrod")
 endfunction
 
-call g:SyntasticRegistry.CreateAndRegisterChecker({
-    \ 'filetype': 'nimrod',
-    \ 'name': 'nimrod'})
+if exists("g:SyntasticRegistry")
+  call g:SyntasticRegistry.CreateAndRegisterChecker({
+      \ 'filetype': 'nimrod',
+      \ 'name': 'nimrod'})
+endif
+
diff --git a/syntax/nimrod.vim b/syntax/nimrod.vim
index 76af145..0de7c6b 100644
--- a/syntax/nimrod.vim
+++ b/syntax/nimrod.vim
@@ -38,7 +38,7 @@ syn keyword nimrodKeyword       finally for from
 syn keyword nimrodKeyword       generic
 syn keyword nimrodKeyword       if import in include interface is isnot iterator
 syn keyword nimrodKeyword       lambda let
-syn keyword nimrodKeyword       mixin mod
+syn keyword nimrodKeyword       mixin using mod
 syn keyword nimrodKeyword       nil not notin
 syn keyword nimrodKeyword       object of or out
 syn keyword nimrodKeyword       proc method macro template nextgroup=nimrodFunction skipwhite