diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index cafc139b36..2e86f5142f 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -289,6 +289,7 @@ p a {
 		<li>[Fix] Disallow post/pm subjects entirely made up from non-printable chars and whitespaces (Bug #13800)</li>
 		<li>[Fix] Allow moving private messages from the sentbox (Bug #13791)</li>
 		<li>[Fix] Properly export localized imagesets</li>
+		<li>[Feature] Show the size of Firebird databases</li>
 
 	</ul>
 
diff --git a/phpBB/includes/functions_admin.php b/phpBB/includes/functions_admin.php
index 2c3eb61dce..29d52406da 100644
--- a/phpBB/includes/functions_admin.php
+++ b/phpBB/includes/functions_admin.php
@@ -2792,6 +2792,17 @@ function get_database_size()
 			}
 		break;
 
+		case 'firebird':
+			global $dbname;
+
+			// if it on the local machine, we can get lucky
+			if (file_exists($dbname))
+			{
+				$database_size = filesize($dbname);
+			}
+
+		break;
+
 		case 'sqlite':
 			global $dbhost;