diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index 055301c24d9b3ad84ee15c62464295076f6e7cf3..247d51fa2b4c22c18393d03070dcea1400dee3ee 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -1661,16 +1661,6 @@ function drupal_static_reset($name = NULL) {
   drupal_static($name, NULL, TRUE);
 }
 
-/**
- * Detects whether the current script is running in a command-line environment.
- *
- * @deprecated in Drupal 8.x-dev, will be removed before Drupal 8.0.
- *   Check the PHP_SAPI value directly instead.
- */
-function drupal_is_cli() {
-  return PHP_SAPI === 'cli';
-}
-
 /**
  * Formats text for emphasized display in a placeholder inside a sentence.
  *