diff --git a/src/Composer/Command/ShowCommand.php b/src/Composer/Command/ShowCommand.php
index 6be8fdc7c..7451e0a16 100644
--- a/src/Composer/Command/ShowCommand.php
+++ b/src/Composer/Command/ShowCommand.php
@@ -77,6 +77,7 @@ EOT
 
         // show single package or single version
         if ($input->getArgument('package') || !empty($package)) {
+            $versions = array();
             if (empty($package)) {
                 list($package, $versions) = $this->getPackage($installedRepo, $repos, $input->getArgument('package'), $input->getArgument('version'));