diff --git a/java_tools/configuration_definition/src/main/java/com/rusefi/ConfigField.java b/java_tools/configuration_definition/src/main/java/com/rusefi/ConfigField.java
index 76aa829d55..5c656c233f 100644
--- a/java_tools/configuration_definition/src/main/java/com/rusefi/ConfigField.java
+++ b/java_tools/configuration_definition/src/main/java/com/rusefi/ConfigField.java
@@ -204,7 +204,7 @@ public class ConfigField {
         return "ConfigField{" +
                 "name='" + name + '\'' +
                 ", type='" + type + '\'' +
-                ", arraySizes=" + arraySizes +
+                ", arraySizes=" + Arrays.toString(arraySizes) +
                 '}';
     }