diff --git a/system/pancake/config/constants.php b/system/pancake/config/constants.php
index 514e941..5661c33 100755
--- a/system/pancake/config/constants.php
+++ b/system/pancake/config/constants.php
@@ -41,6 +41,15 @@ define('FOPEN_READ_WRITE_CREATE_STRICT', 'x+b');
 
 require 'base_url.php';
 $details = detect_base_url($_SERVER, FCPATH);
+
+// Allow overriding the detected base URL via environment variable.
+$envBaseUrl = getenv('PANCAKE_BASE_URL');
+if ($envBaseUrl !== false && $envBaseUrl !== '') {
+    $envBaseUrl = rtrim($envBaseUrl, '/') . '/';
+    $details['url'] = $envBaseUrl;
+    $details['is_ssl'] = (stripos($envBaseUrl, 'https://') === 0);
+}
+
 define('BASE_URL', $details['url']);
 define('IS_SSL', $details['is_ssl']);
 define('SCHEME', IS_SSL ? 'https' : 'http');