diff --git a/mapping.vim b/mapping.vim
index 7aff7db..79d60c0 100644
--- a/mapping.vim
+++ b/mapping.vim
@@ -9,5 +9,5 @@ nmap <F9> :TagbarToggle<CR>
 nmap <F8> :NERDTreeToggle<CR>
 " open tree to current buffer
 nmap <S-F8> :NERDTreeFind<CR>
-" use same key, esc, to exit terminal mode
-tnoremap <Esc> <C-\><C-n>
+" use similar key, esc, to exit terminal mode
+tnoremap <C-Space><Esc> <C-\><C-n>