diff --git a/src/wp-includes/class-wp-hook.php b/src/wp-includes/class-wp-hook.php
index 4796503dcc2a9..5b99209fb33cf 100644
--- a/src/wp-includes/class-wp-hook.php
+++ b/src/wp-includes/class-wp-hook.php
@@ -302,7 +302,7 @@ public function apply_filters( $value, $args ) {
 				}
 
 				// Avoid the array_slice() if possible.
-				if ( 0 == $the_['accepted_args'] ) {
+				if ( 0 === (int) $the_['accepted_args'] ) {
 					$value = call_user_func( $the_['function'] );
 				} elseif ( $the_['accepted_args'] >= $num_args ) {
 					$value = call_user_func_array( $the_['function'], $args );