diff --git a/_example/etc/handler-apache2.4.conf b/_example/etc/handler-apache2.4.conf
index 4ed8f306c..e54bf757b 100644
--- a/_example/etc/handler-apache2.4.conf
+++ b/_example/etc/handler-apache2.4.conf
@@ -46,7 +46,7 @@ ErrorDocument 503 http://auth.__DNSDOMAIN__/lmerror/503
     #</Location>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
 
 
diff --git a/_example/etc/handler-apache2.X.conf b/_example/etc/handler-apache2.X.conf
index a990691a1..035b4d467 100644
--- a/_example/etc/handler-apache2.X.conf
+++ b/_example/etc/handler-apache2.X.conf
@@ -63,7 +63,7 @@ ErrorDocument 503 http://auth.__DNSDOMAIN__/lmerror/503
     #</Location>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
 
 
diff --git a/_example/etc/handler-apache2.conf b/_example/etc/handler-apache2.conf
index 1323e7a76..94a27d79d 100644
--- a/_example/etc/handler-apache2.conf
+++ b/_example/etc/handler-apache2.conf
@@ -53,7 +53,7 @@ ErrorDocument 503 http://auth.__DNSDOMAIN__/lmerror/503
     #</Location>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
 
 
diff --git a/_example/etc/handler-nginx.conf b/_example/etc/handler-nginx.conf
index a3643f26e..bcc041dc5 100644
--- a/_example/etc/handler-nginx.conf
+++ b/_example/etc/handler-nginx.conf
@@ -50,7 +50,7 @@ server {
     deny all;
 
     # Uncomment this if you use https only
-    #add_header Strict-Transport-Security "15768000";
+    #add_header Strict-Transport-Security "max-age=15768000";
   }
 
   # Uncomment this if status is enabled
diff --git a/_example/etc/manager-apache2.4.conf b/_example/etc/manager-apache2.4.conf
index 81708be6d..adb89d0ad 100644
--- a/_example/etc/manager-apache2.4.conf
+++ b/_example/etc/manager-apache2.4.conf
@@ -94,5 +94,5 @@
     </Directory>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
diff --git a/_example/etc/manager-apache2.X.conf b/_example/etc/manager-apache2.X.conf
index 9f6d10359..25377f236 100644
--- a/_example/etc/manager-apache2.X.conf
+++ b/_example/etc/manager-apache2.X.conf
@@ -107,5 +107,5 @@
     </Directory>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
diff --git a/_example/etc/manager-apache2.conf b/_example/etc/manager-apache2.conf
index ef84ddf71..dc5453639 100644
--- a/_example/etc/manager-apache2.conf
+++ b/_example/etc/manager-apache2.conf
@@ -91,5 +91,5 @@
     </Directory>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
diff --git a/_example/etc/manager-nginx.conf b/_example/etc/manager-nginx.conf
index 21ba639d9..e192daa6a 100644
--- a/_example/etc/manager-nginx.conf
+++ b/_example/etc/manager-nginx.conf
@@ -36,7 +36,7 @@ server {
     #uwsgi_param SCRIPT_NAME $sc;
 
     # Uncomment this if you use https only
-    #add_header Strict-Transport-Security "15768000";
+    #add_header Strict-Transport-Security "max-age=15768000";
   }
 
   location / {
diff --git a/_example/etc/portal-apache2.4.conf b/_example/etc/portal-apache2.4.conf
index 735fd59bc..540eca15f 100644
--- a/_example/etc/portal-apache2.4.conf
+++ b/_example/etc/portal-apache2.4.conf
@@ -103,6 +103,6 @@
     </Location>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
 
diff --git a/_example/etc/portal-apache2.X.conf b/_example/etc/portal-apache2.X.conf
index e843e3706..b326eefdd 100644
--- a/_example/etc/portal-apache2.X.conf
+++ b/_example/etc/portal-apache2.X.conf
@@ -128,6 +128,6 @@
     </Location>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
 
diff --git a/_example/etc/portal-apache2.conf b/_example/etc/portal-apache2.conf
index 0c9122ab8..1ba0ee79d 100644
--- a/_example/etc/portal-apache2.conf
+++ b/_example/etc/portal-apache2.conf
@@ -104,6 +104,6 @@
     </Location>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
 
diff --git a/_example/etc/portal-nginx.conf b/_example/etc/portal-nginx.conf
index d96eccc43..f3081a0ee 100644
--- a/_example/etc/portal-nginx.conf
+++ b/_example/etc/portal-nginx.conf
@@ -54,7 +54,7 @@ server {
     try_files $uri $uri/ =404;
 
     # Uncomment this if you use https only
-    #add_header Strict-Transport-Security max-age=15768000;
+    #add_header Strict-Transport-Security "max-age=15768000";
   }
 
   location /static/ {
diff --git a/_example/etc/test-apache2.4.conf b/_example/etc/test-apache2.4.conf
index 522185c3b..d69f131d7 100644
--- a/_example/etc/test-apache2.4.conf
+++ b/_example/etc/test-apache2.4.conf
@@ -43,5 +43,5 @@ PerlModule Lemonldap::NG::Handler::ApacheMP2::Menu
     </IfModule>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
diff --git a/_example/etc/test-apache2.X.conf b/_example/etc/test-apache2.X.conf
index cfff40ae2..84ddac8e4 100644
--- a/_example/etc/test-apache2.X.conf
+++ b/_example/etc/test-apache2.X.conf
@@ -43,5 +43,5 @@ PerlModule Lemonldap::NG::Handler::ApacheMP2::Menu
     </IfModule>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
diff --git a/_example/etc/test-apache2.conf b/_example/etc/test-apache2.conf
index 5401e4eed..168e8a242 100644
--- a/_example/etc/test-apache2.conf
+++ b/_example/etc/test-apache2.conf
@@ -38,5 +38,5 @@ PerlModule Lemonldap::NG::Handler::ApacheMP2::Menu
     </IfModule>
 
     # Uncomment this if site if you use SSL only
-    #Header set Strict-Transport-Security 15768000
+    #Header set Strict-Transport-Security "max-age=15768000"
 </VirtualHost>
diff --git a/_example/etc/test-nginx.conf b/_example/etc/test-nginx.conf
index 302c1c9cc..6b3382386 100644
--- a/_example/etc/test-nginx.conf
+++ b/_example/etc/test-nginx.conf
@@ -86,7 +86,7 @@ server {
     #fastcgi_param HTTP_COOKIE $lmcookie;
 
     # Uncomment this if you use https only
-    #add_header Strict-Transport-Security "15768000";
+    #add_header Strict-Transport-Security "max-age=15768000";
 
     # Set REMOTE_USER (for FastCGI apps only)
     #fastcgi_param REMOTE_USER $lmremote_user;