diff --git a/autoload/fireplace/nrepl.vim b/autoload/fireplace/nrepl.vim
index 4b0862b..a5ba381 100644
--- a/autoload/fireplace/nrepl.vim
+++ b/autoload/fireplace/nrepl.vim
@@ -140,7 +140,7 @@ function! s:nrepl_eval(expr, ...) dict abort
     endif
     throw 'Clojure: Interrupt'
   endtry
-  if has_key(response, 'ns') && !a:0
+  if has_key(response, 'ns') && !has_key(options, 'ns')
     let self.ns = response.ns
   endif