diff --git a/jkube-kit/jkube-kit-vertx/src/main/java/org/eclipse/jkube/vertx/enricher/VertxHealthCheckEnricher.java b/jkube-kit/jkube-kit-vertx/src/main/java/org/eclipse/jkube/vertx/enricher/VertxHealthCheckEnricher.java
index ca7a6358f0..04b0c206dd 100644
--- a/jkube-kit/jkube-kit-vertx/src/main/java/org/eclipse/jkube/vertx/enricher/VertxHealthCheckEnricher.java
+++ b/jkube-kit/jkube-kit-vertx/src/main/java/org/eclipse/jkube/vertx/enricher/VertxHealthCheckEnricher.java
@@ -278,7 +278,7 @@ private Optional<List<String>> getListValue(Config config, boolean readiness) {
             } else {
                 throw new IllegalArgumentException(String.format(
                     ERROR_MESSAGE,
-                    config.getKey(), input.getClass(), input.toString()));
+                    config.getKey(), input.getClass(), input));
             }
 
         });