diff --git a/src/wp-includes/class-wp-comment-query.php b/src/wp-includes/class-wp-comment-query.php
index 7064d1690f..9f6aaa5327 100644
--- a/src/wp-includes/class-wp-comment-query.php
+++ b/src/wp-includes/class-wp-comment-query.php
@@ -758,7 +758,7 @@ class WP_Comment_Query {
 			foreach ( $post_fields as $field_name => $field_value ) {
 				// $field_value may be an array.
 				$esses = array_fill( 0, count( (array) $field_value ), '%s' );
-				$this->sql_clauses['where']['post_fields'] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $field_value );
+				$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $field_value );
 			}
 		}
 
diff --git a/tests/phpunit/tests/comment/query.php b/tests/phpunit/tests/comment/query.php
index 34037bda7c..eda13a973c 100644
--- a/tests/phpunit/tests/comment/query.php
+++ b/tests/phpunit/tests/comment/query.php
@@ -534,6 +534,43 @@ class Tests_Comment_Query extends WP_UnitTestCase {
 		$this->assertEqualSets( array( $c1, $c2 ), $found );
 	}
 
+	/**
+	 * @ticket 35478
+	 */
+	public function test_multiple_post_fields_should_all_be_respected() {
+		$posts = array();
+
+		$posts[] = self::factory()->post->create( array(
+			'post_status' => 'publish',
+			'post_author' => 3,
+		) );
+
+		$posts[] = self::factory()->post->create( array(
+			'post_status' => 'draft',
+			'post_author' => 4,
+		) );
+
+		$posts[] = self::factory()->post->create( array(
+			'post_status' => 'draft',
+			'post_author' => 3,
+		) );
+
+		$comments = array();
+		foreach ( $posts as $post ) {
+			$comments[] = self::factory()->comment->create( array(
+				'comment_post_ID' => $post,
+			) );
+		}
+
+		$q = new WP_Comment_Query( array(
+			'post_status' => 'draft',
+			'post_author' => 3,
+			'fields' => 'ids',
+		) );
+
+		$this->assertSame( array( $comments[2] ), $q->comments );
+	}
+
 	function test_get_comments_for_post() {
 		$limit = 5;