diff --git a/app/constants.php b/app/constants.php
index 4a32c07..50dda97 100644
--- a/app/constants.php
+++ b/app/constants.php
@@ -24,6 +24,7 @@ defined('DB_PASSWORD') or define('DB_PASSWORD', '');
 defined('DEBUG_MODE') or define('DEBUG_MODE', false);
 defined('DEBUG_FILENAME') or define('DEBUG_FILENAME', DATA_DIRECTORY.DIRECTORY_SEPARATOR.'debug.log');
 
+defined('BASE_URL') or define('BASE_URL', '');
 defined('THEME_DIRECTORY') or define('THEME_DIRECTORY', 'themes');
 defined('THEME_URL_PATH') or define('THEME_URL_PATH', 'themes');
 defined('SESSION_SAVE_PATH') or define('SESSION_SAVE_PATH', '');
diff --git a/app/helpers/app.php b/app/helpers/app.php
index 0b09bcf..bb10d54 100644
--- a/app/helpers/app.php
+++ b/app/helpers/app.php
@@ -44,16 +44,20 @@ function parse_app_version($refnames, $commithash)
 
 function get_current_base_url()
 {
-    $url = is_secure_connection() ? 'https://' : 'http://';
-    $url .= $_SERVER['HTTP_HOST'];
+    if(BASE_URL) {
+        $url = BASE_URL;
+        return rtrim($url, '/') . '/';
+    } else {
+        $url = is_secure_connection() ? 'https://' : 'http://';
+        $url .= $_SERVER['HTTP_HOST'];
 
-    if (strpos($_SERVER['HTTP_HOST'], ':') === false) {
-        $url .= $_SERVER['SERVER_PORT'] == 80 || $_SERVER['SERVER_PORT'] == 443 ? '' : ':'.$_SERVER['SERVER_PORT'];
+        if (strpos($_SERVER['HTTP_HOST'], ':') === false) {
+            $url .= $_SERVER['SERVER_PORT'] == 80 || $_SERVER['SERVER_PORT'] == 443 ? '' : ':'.$_SERVER['SERVER_PORT'];
+        }
+        $url .= str_replace('\\', '/', dirname($_SERVER['PHP_SELF'])) !== '/' ? str_replace('\\', '/', dirname($_SERVER['PHP_SELF'])).'/' : '/';
+
+        return $url;
     }
-
-    $url .= str_replace('\\', '/', dirname($_SERVER['PHP_SELF'])) !== '/' ? str_replace('\\', '/', dirname($_SERVER['PHP_SELF'])).'/' : '/';
-
-    return $url;
 }
 
 function is_secure_connection()
diff --git a/config.default.php b/config.default.php
index 10d25ff..06f1fdb 100644
--- a/config.default.php
+++ b/config.default.php
@@ -6,6 +6,9 @@ define('HTTP_TIMEOUT', '20');
 // HTTP_MAX_RESPONSE_SIZE => Maximum accepted size of the response body in MB (default 2MB)
 define('HTTP_MAX_RESPONSE_SIZE', 2097152);
 
+// BASE_URL => URL that clients should access this instance of miniflux from
+define('BASE_URL', '');
+
 // DATA_DIRECTORY => default is data (writable directory)
 define('DATA_DIRECTORY', 'data');