diff --git a/plugins/wordpress-mu-plugin-fasauth/fasauth.php b/plugins/wordpress-mu-plugin-fasauth/fasauth.php
index ba108c5..0139553 100644
--- a/plugins/wordpress-mu-plugin-fasauth/fasauth.php
+++ b/plugins/wordpress-mu-plugin-fasauth/fasauth.php
@@ -57,7 +57,7 @@ if (!function_exists('wp_authenticate')) {
 
             // check minimum requirements
             if (check_login_requirement($fasuserdata) !== true) {
-                fwrite(STDERR, "FAS auth failed for $username: insufficient group membership\n");
+                error_log("FAS auth failed for $username: insufficient group membership", 0);
                 return new WP_Error('fasauth_min_requirement', __('<strong>Error</strong>: You do not meet minimum requirements to login.'));		
             }
 
@@ -71,16 +71,16 @@ if (!function_exists('wp_authenticate')) {
                     return new WP_Error('fasauth_create_wp_user', __('<strong>Error</strong>: Unable to create account. Please contact the webmaster.'));		
                 }
 
-                fwrite(STDERR, "FAS auth succeeded for $username\n");
+                error_log("FAS auth succeeded for $username", 0);
                 return new WP_User($user_id);
             }
 
             // all good, let go on
-            fwrite(STDERR, "FAS auth succeeded for $username\n");
+            error_log("FAS auth succeeded for $username", 0);
             return new WP_User($user->ID);
 
         } else {
-            fwrite(STDERR, "FAS auth failed for $username: incorrect username or password\n");
+            error_log("FAS auth failed for $username: incorrect username or password", 0);
             return new WP_Error('fasauth_wrong_credentials', __('<strong>Error</strong>: FAS login unsuccessful.'));
         }
     }
diff --git a/scripts/Auth_FAS_MediaWiki/Auth_FAS.php b/scripts/Auth_FAS_MediaWiki/Auth_FAS.php
index eb6881a..e429f5c 100644
--- a/scripts/Auth_FAS_MediaWiki/Auth_FAS.php
+++ b/scripts/Auth_FAS_MediaWiki/Auth_FAS.php
@@ -28,7 +28,7 @@ class Auth_FAS extends AuthPlugin {
         curl_close ($ch);
 
         if (!isset($response["success"])) {
-            fwrite(STDERR, "FAS auth failed for $username: incorrect username or password\n");
+            error_log("FAS auth failed for $username: incorrect username or password", 0);
             return false;
         }
 
@@ -36,11 +36,11 @@ class Auth_FAS extends AuthPlugin {
 
         for ($i = 0, $cnt = count($groups); $i < $cnt; $i++) {
             if ($groups[$i]["name"] == "cla_done") {
-                fwrite(STDERR, "FAS auth succeeded for $username\n");
+                error_log("FAS auth succeeded for $username", 0);
                 return true;
             }
         }
-        fwrite(STDERR, "FAS auth failed for $username: insufficient group membership\n");
+        error_log("FAS auth failed for $username: insufficient group membership", 0);
         return false;
     }