diff --git a/src/wp-includes/formatting.php b/src/wp-includes/formatting.php
index 1a8d7b6507..021f14ebbb 100644
--- a/src/wp-includes/formatting.php
+++ b/src/wp-includes/formatting.php
@@ -2676,10 +2676,6 @@ function untrailingslashit( $string ) {
  * @return string Returns a string escaped with slashes.
  */
 function addslashes_gpc( $gpc ) {
-	if ( get_magic_quotes_gpc() ) {
-		$gpc = stripslashes( $gpc );
-	}
-
 	return wp_slash( $gpc );
 }
 
@@ -4779,9 +4775,7 @@ function map_deep( $value, $callback ) {
  */
 function wp_parse_str( $string, &$array ) {
 	parse_str( $string, $array );
-	if ( get_magic_quotes_gpc() ) {
-		$array = stripslashes_deep( $array );
-	}
+
 	/**
 	 * Filters the array of variables derived from a parsed string.
 	 *
diff --git a/src/wp-includes/load.php b/src/wp-includes/load.php
index 38b4b771b2..133c03d11e 100644
--- a/src/wp-includes/load.php
+++ b/src/wp-includes/load.php
@@ -925,13 +925,6 @@ function wp_set_internal_encoding() {
  * @access private
  */
 function wp_magic_quotes() {
-	// If already slashed, strip.
-	if ( get_magic_quotes_gpc() ) {
-		$_GET    = stripslashes_deep( $_GET );
-		$_POST   = stripslashes_deep( $_POST );
-		$_COOKIE = stripslashes_deep( $_COOKIE );
-	}
-
 	// Escape with wpdb.
 	$_GET    = add_magic_quotes( $_GET );
 	$_POST   = add_magic_quotes( $_POST );
diff --git a/src/wp-includes/rest-api/class-wp-rest-request.php b/src/wp-includes/rest-api/class-wp-rest-request.php
index 3089547ce7..38bc0570a3 100644
--- a/src/wp-includes/rest-api/class-wp-rest-request.php
+++ b/src/wp-includes/rest-api/class-wp-rest-request.php
@@ -689,15 +689,6 @@ protected function parse_body_params() {
 
 		parse_str( $this->get_body(), $params );
 
-		/*
-		 * Amazingly, parse_str follows magic quote rules. Sigh.
-		 *
-		 * NOTE: Do not refactor to use `wp_unslash`.
-		 */
-		if ( get_magic_quotes_gpc() ) {
-			$params = stripslashes_deep( $params );
-		}
-
 		/*
 		 * Add to the POST parameters stored internally. If a user has already
 		 * set these manually (via `set_body_params`), don't override them.