diff --git a/tasks/local-certificate.yml b/tasks/local-certificate.yml
index 1be5bd2..a410a63 100644
--- a/tasks/local-certificate.yml
+++ b/tasks/local-certificate.yml
@@ -22,7 +22,7 @@
     cert_path: "{{ certificate_cert_path }}"
     chain_path: "{{ certificate_chain_path if certificate_chain_path is defined else None }}"
     privatekey_path: "{{ certificate_privatekey_path if certificate_privatekey_path is defined else None }}"
-    privatekey_size: "{{ certificate_privatekey_size if certificate_privatekey_size is defined else None }}"
+    privatekey_size: "{{ certificate_privatekey_size if certificate_privatekey_size is defined else 4096 }}"
     common_name: "{{ certificate_common_name }}"
     alt_name: "{{ certificate_alt_name | default([]) }}"
     before_expired_hours: "{{ certificate_before_expired_hours if certificate_before_expired_hours is defined else 72 }}"
diff --git a/tasks/remote-certificate.yml b/tasks/remote-certificate.yml
index b0f9af4..182ad93 100644
--- a/tasks/remote-certificate.yml
+++ b/tasks/remote-certificate.yml
@@ -12,7 +12,7 @@
     cert_path: "{{ certificate_cert_path }}"
     chain_path: "{{ certificate_chain_path if certificate_chain_path is defined else None }}"
     privatekey_path: "{{ certificate_privatekey_path if certificate_privatekey_path is defined else None }}"
-    privatekey_size: "{{ certificate_privatekey_size if certificate_privatekey_size is defined else None }}"
+    privatekey_size: "{{ certificate_privatekey_size if certificate_privatekey_size is defined else 4096 }}"
     common_name: "{{ certificate_common_name }}"
     alt_name: "{{ certificate_alt_name | default([]) }}"
     before_expired_hours: "{{ certificate_before_expired_hours if certificate_before_expired_hours is defined else None }}"