diff --git a/tests/bug_79866.phpt b/tests/bug_79866.phpt
index 2189b90..6dbc813 100644
--- a/tests/bug_79866.phpt
+++ b/tests/bug_79866.phpt
@@ -29,7 +29,7 @@ $floats = [
 foreach( $floats as $idx => $float ) {
   $float = floatval($float);
   ob_start();
-  echo $float;
+  @print_r($float);
   $native = ob_get_clean();
 
   $expect = "--- {$native}\n...\n";