diff --git a/plugin/lexima.vim b/plugin/lexima.vim
index f7b377d..54ec43b 100644
--- a/plugin/lexima.vim
+++ b/plugin/lexima.vim
@@ -20,6 +20,7 @@ endif
 
 function! s:setup_insmode()
   if get(b:, 'lexima_disabled', 0)
+    iunmap! <esc>
     return
   endif