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	diff --git a/includes/search/SearchMySQL.php b/includes/search/SearchMySQL.php
	index 55445051106..d5d39ce0cc4 100644
	--- a/includes/search/SearchMySQL.php
	+++ b/includes/search/SearchMySQL.php
	@@ -162,6 +162,17 @@ class SearchMySQL extends SearchDatabase {

	public function legalSearchChars( $type = self::CHARS_ALL ) {
	$searchChars = parent::legalSearchChars( $type );
	+
	+ // In the MediaWiki UI, search strings containing (just) a hyphen are translated into
	+ // MATCH(si_title) AGAINST('+- ' IN BOOLEAN MODE)
	+ // which is not valid.
	+
	+ // From <https://dev.mysql.com/doc/refman/8.0/en/fulltext-boolean.html>:
	+ // "InnoDB full-text search does not support... a plus and minus sign combination ('+-')"
	+
	+ // See also https://phabricator.wikimedia.org/T221560
	+ $searchChars = preg_replace( '/\\\\-/', '', $searchChars );
	+
	if ( $type === self::CHARS_ALL ) {
	// " for phrase, * for wildcard
	$searchChars = "\"*" . $searchChars;