diff --git a/core/prelude-core.el b/core/prelude-core.el
index 350ba65..a9a3abf 100644
--- a/core/prelude-core.el
+++ b/core/prelude-core.el
@@ -311,6 +311,12 @@ buffer is not visiting a file."
       (set-window-start w2 s1)))
   (other-window 1))
 
+(defun prelude-switch-to-previous-buffer ()
+  "Switch to previously open buffer.
+Repeated invocations toggle between the two most recently open buffers."
+  (interactive)
+  (switch-to-buffer (other-buffer (current-buffer) 1)))
+
 (defun prelude-kill-other-buffers ()
   "Kill all buffers but the current one.
 Doesn't mess with special buffers."
diff --git a/core/prelude-global-keybindings.el b/core/prelude-global-keybindings.el
index de1d310..06b1ae0 100644
--- a/core/prelude-global-keybindings.el
+++ b/core/prelude-global-keybindings.el
@@ -115,6 +115,7 @@
 (require 'key-chord)
 
 (key-chord-define-global "jj" 'ace-jump-mode)
+(key-chord-define-global "JJ" 'prelude-switch-to-previous-buffer)
 
 (key-chord-mode +1)