diff --git a/src/Composer/Command/ShowCommand.php b/src/Composer/Command/ShowCommand.php
index 166129989..c0b515401 100644
--- a/src/Composer/Command/ShowCommand.php
+++ b/src/Composer/Command/ShowCommand.php
@@ -185,6 +185,11 @@ EOT
                     }
                 }
                 list($width) = $this->getApplication()->getTerminalDimensions();
+                if (null === $width) {
+                    // In case the width is not detected, we're probably running the command
+                    // outside of a real terminal, use space without a limit
+                    $width = INF;
+                }
                 if (defined('PHP_WINDOWS_VERSION_BUILD')) {
                     $width--;
                 }