-bind Escape copy-mode
-unbind p
-bind p paste-buffer
-bind -t vi-copy 'v' begin-selection
-bind -t vi-copy 'y' copy-selection
-bind -t vi-copy 'Space' halfpage-down
-bind -t vi-copy 'Bspace' halfpage-up
+bind-key Escape copy-mode
+unbind-key p
+bind-key p paste-buffer
+bind-key -T copy-mode-vi 'v' send-keys -X begin-selection
+bind-key -T copy-mode-vi 'y' send-keys -X copy-selection
+bind-key -T copy-mode-vi 'Space' send-keys -X halfpage-down
+bind-key -T copy-mode-vi 'Bspace' send-keys -X halfpage-up