diff --git a/src/Psalm/Config/FileFilter.php b/src/Psalm/Config/FileFilter.php
index 1443594c7a7..76f53d6be2e 100644
--- a/src/Psalm/Config/FileFilter.php
+++ b/src/Psalm/Config/FileFilter.php
@@ -170,8 +170,7 @@ public static function loadFromArray(
                     }
 
                     throw new ConfigException(
-                        'Could not resolve config path to ' . $base_dir
-                        . DIRECTORY_SEPARATOR . $directory_path
+                        'Could not resolve config path to ' . $prospective_directory_path
                     );
                 }