diff --git a/lib/Zonemaster/Engine.pm b/lib/Zonemaster/Engine.pm
index 4ad526bec..5fe64a712 100644
--- a/lib/Zonemaster/Engine.pm
+++ b/lib/Zonemaster/Engine.pm
@@ -37,7 +37,7 @@ my $init_done = 0;
 
 sub init_engine {
     return if $init_done++;
-    Zonemaster::Engine::Recursor::init_recursor;
+    Zonemaster::Engine::Recursor::init_recursor();
 }
 
 sub logger {