diff --git a/src/Composer/Command/ConfigCommand.php b/src/Composer/Command/ConfigCommand.php
index 952baa815..d7f4ad78a 100644
--- a/src/Composer/Command/ConfigCommand.php
+++ b/src/Composer/Command/ConfigCommand.php
@@ -413,7 +413,7 @@ EOT
             ],
             'bin-compat' => [
                 static function ($val): bool {
-                    return in_array($val, ['auto', 'full', 'symlink']);
+                    return in_array($val, ['auto', 'full', 'proxy', 'symlink']);
                 },
                 static function ($val) {
                     return $val;