diff --git a/changelogs/fragments/586-helm-fix-post-renderer-arg.yml b/changelogs/fragments/586-helm-fix-post-renderer-arg.yml
new file mode 100644
index 0000000000..2582a48629
--- /dev/null
+++ b/changelogs/fragments/586-helm-fix-post-renderer-arg.yml
@@ -0,0 +1,3 @@
+---
+bugfixes:
+  - helm - fix post_renderer argument breaking the helm deploy_command (https://github.com/ansible-collections/kubernetes.core/pull/586).
diff --git a/plugins/modules/helm.py b/plugins/modules/helm.py
index 8c6d5dd14a..ad80af83c0 100644
--- a/plugins/modules/helm.py
+++ b/plugins/modules/helm.py
@@ -554,7 +554,7 @@ def deploy(
         module.add_cleanup_file(path)
 
     if post_renderer:
-        deploy_command = " --post-renderer=" + post_renderer
+        deploy_command += " --post-renderer=" + post_renderer
 
     if skip_crds:
         deploy_command += " --skip-crds"