Index: src/wp-includes/class-wp-term-query.php
===================================================================
--- src/wp-includes/class-wp-term-query.php	(revision 41808)
+++ src/wp-includes/class-wp-term-query.php	(working copy)
@@ -483,10 +483,10 @@
 			( is_string( $args['slug'] ) && 0 !== strlen( $args['slug'] ) )
 		) {
 			if ( is_array( $args['slug'] ) ) {
-				$slug = array_map( 'sanitize_title', $args['slug'] );
+				$slug = array_map( 'sanitize_title_for_query', $args['slug'] );
 				$this->sql_clauses['where']['slug'] = "t.slug IN ('" . implode( "', '", $slug ) . "')";
 			} else {
-				$slug = sanitize_title( $args['slug'] );
+				$slug = sanitize_title_for_query( $args['slug'] );
 				$this->sql_clauses['where']['slug'] = "t.slug = '$slug'";
 			}
 		}
Index: src/wp-includes/default-filters.php
===================================================================
--- src/wp-includes/default-filters.php	(revision 41808)
+++ src/wp-includes/default-filters.php	(working copy)
@@ -74,7 +74,7 @@
 }
 
 // Slugs
-add_filter( 'pre_term_slug', 'sanitize_title' );
+add_filter( 'pre_term_slug', 'sanitize_title_for_query' );
 add_filter( 'wp_insert_post_data', '_wp_customize_changeset_filter_insert_post_data', 10, 2 );
 
 // Keys