diff --git a/plugins/modules/aws_acm.py b/plugins/modules/aws_acm.py
index 1125ead5036..d6ba255d575 100644
--- a/plugins/modules/aws_acm.py
+++ b/plugins/modules/aws_acm.py
@@ -202,7 +202,7 @@
 - name: create/update a certificate with a chain
   community.aws.aws_acm:
     certificate: "{{ lookup('file', 'cert.pem' ) }}"
-    privateKey: "{{ lookup('file', 'key.pem' ) }}"
+    private_key: "{{ lookup('file', 'key.pem' ) }}"
     name_tag: my_cert
     certificate_chain: "{{ lookup('file', 'chain.pem' ) }}"
     state: present