diff --git a/core/core.el b/core/core.el
index 17330e53c..20babb950 100644
--- a/core/core.el
+++ b/core/core.el
@@ -162,12 +162,6 @@ users).")
 ;; to, it's our (the user's) failure. One case for all!
 (setq auto-mode-case-fold nil)
 
-;; Make all regexps case-sensitive by default. This favors correctness for
-;; programmatical regexp searches and provides a slight performance benefit to
-;; font-locking where the keywords don't let-bind `case-fold-search' themselves
-;; and are already case-correct. This could break poorly written packages!
-(setq-default case-fold-search nil)
-
 ;; Display the bare minimum at startup. We don't need all that noise. The
 ;; dashboard/empty scratch buffer is good enough.
 (setq inhibit-startup-message t