diff --git a/tasks/download/nexus.yml b/tasks/download/nexus.yml
index 3026558..a907384 100644
--- a/tasks/download/nexus.yml
+++ b/tasks/download/nexus.yml
@@ -11,8 +11,8 @@
     repository_url: "{{ item.repository_url }}"
     dest: "{{ dispatcher_download_path }}/{{ dispatcher_tarball_name }}"
     extension: tar.gz
-    username: "{{ nexus_username }}"
-    password: "{{ nexus_password }}"
+    username: "{{ nexus_username | default(omit) }}"
+    password: "{{ nexus_password | default(omit) }}"
     version: "{{ item.version | default(dispatcher_version) }}"
     classifier: "{{ item.classifier | default(dispatcher_tarball_name | regex_replace('dispatcher-(.*)-([\\d\\.]*)\\.tar\\.gz', '\\1')) }}"
   with_items: "{{ dispatcher_mvn_coordinates }}"
\ No newline at end of file