diff --git a/oni-ediff.el b/oni-ediff.el
index b18e625..8ea9589 100644
--- a/oni-ediff.el
+++ b/oni-ediff.el
@@ -68,6 +68,8 @@
 
 (setq ediff-diff-options "-w")
 
+(setq-default ediff-auto-refine 'on)
+
 (add-hook 'ediff-mode-hook #'oni-ediff--turn-on-fullscreen)
 (add-hook 'ediff-cleanup-hook #'oni-ediff--turn-off-fullscreen)