diff --git a/tests/Issues/StraussIssue109Test.php b/tests/Issues/StraussIssue109Test.php
new file mode 100644
index 00000000..4961bc2c
--- /dev/null
+++ b/tests/Issues/StraussIssue109Test.php
@@ -0,0 +1,52 @@
+<?php
+/**
+ * Defined CLI arguments are breaking the extra.strauss config even when they are not present.
+ *
+ * @see https://github.com/BrianHenryIE/strauss/pull/109
+ */
+
+namespace BrianHenryIE\Strauss\Tests\Issues;
+
+use BrianHenryIE\Strauss\Tests\Integration\Util\IntegrationTestCase;
+
+/**
+ * @package BrianHenryIE\Strauss\Tests\Issues
+ * @coversNothing
+ */
+class StraussIssue109Test extends IntegrationTestCase
+{
+    public function test_absent_cli_argument_parsing_does_not_overwrite_config()
+    {
+        $composerJsonString = <<<'EOD'
+{
+  "name": "strauss/issue104",
+  "require": {
+    "psr/log": "1.0.0"
+  },
+  "extra": {
+    "strauss": {
+      "namespace_prefix": "Strauss\\Issue109\\",
+      "delete_vendor_packages": true
+    }
+  }
+}
+EOD;
+
+        chdir($this->testsWorkingDir);
+
+        file_put_contents($this->testsWorkingDir . '/composer.json', $composerJsonString);
+
+        exec('composer install');
+
+        $_SERVER['argv'] = [$this->projectDir . '/bin/strauss'];
+
+        $version = '0.19.1';
+        $app = new \BrianHenryIE\Strauss\Console\Application($version);
+        $app->setAutoExit(false);
+        $result = $app->run();
+
+        $this->assertEquals(0, $result);
+
+        $this->assertFileDoesNotExist($this->testsWorkingDir . 'vendor/psr/log/composer.json');
+    }
+}