diff --git a/src/Composer/Command/ConfigCommand.php b/src/Composer/Command/ConfigCommand.php
index 099e5c872..518bb7ff3 100644
--- a/src/Composer/Command/ConfigCommand.php
+++ b/src/Composer/Command/ConfigCommand.php
@@ -291,7 +291,7 @@ EOT
                 $value = $data;
             } elseif (isset($data['config'][$settingKey])) {
                 $value = $this->config->get($settingKey, $input->getOption('absolute') ? 0 : Config::RELATIVE_PATHS);
-            } elseif (in_array($settingKey, $properties, true) && isset($rawData[$settingKey])) {
+            } elseif (isset($rawData[$settingKey]) && in_array($settingKey, $properties, true)) {
                 $value = $rawData[$settingKey];
             } else {
                 throw new \RuntimeException($settingKey.' is not defined');