diff --git a/install.php b/install.php
index 6e58d344..94a589b1 100644
--- a/install.php
+++ b/install.php
@@ -3,9 +3,14 @@
 // Installation/upgrade file
 define('VERSION', '5.1.3');
 
-if (!is_writable('inc/instance-config.php') || !is_writable('inc/')) {
-	print('install.php does not have permission to write to /inc/, without permission the installer cannot continue');
-	exit();
+if (!is_writable('inc/instance-config.php')) {
+	if (file_exists('inc/instance-config.php')) {
+		print('install.php does not have permission to write to /inc/instance-config.php, without permission the installer cannot continue');
+		exit();
+	} else if (!is_writable('inc/')) {
+		print('install.php does not have permission to write to /inc/, without permission the installer cannot continue');
+		exit();
+	}
 }
 
 require 'inc/bootstrap.php';