diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
index d14aefb1f6308..a2008d0f6d50e 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-comments-controller.php
@@ -920,7 +920,7 @@ public function update_item( $request ) {
 				return new WP_Error(
 					'rest_comment_invalid_post_id',
 					__( 'Invalid post ID.' ),
-					array( 'status' => 403 )
+					array( 'status' => 404 )
 				);
 			}
 		}
diff --git a/tests/phpunit/tests/rest-api/rest-comments-controller.php b/tests/phpunit/tests/rest-api/rest-comments-controller.php
index 547757ae6042e..e80758eab695a 100644
--- a/tests/phpunit/tests/rest-api/rest-comments-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-comments-controller.php
@@ -2821,7 +2821,7 @@ public function test_update_comment_invalid_post_id() {
 		$request->set_param( 'post', REST_TESTS_IMPOSSIBLY_HIGH_NUMBER );
 
 		$response = rest_get_server()->dispatch( $request );
-		$this->assertErrorResponse( 'rest_comment_invalid_post_id', $response, 403 );
+		$this->assertErrorResponse( 'rest_comment_invalid_post_id', $response, 404 );
 	}
 
 	public function test_update_comment_invalid_permission() {