diff --git a/PHPCI/Plugin/PhpUnit.php b/PHPCI/Plugin/PhpUnit.php
index 7fb626df..9b8aeccc 100644
--- a/PHPCI/Plugin/PhpUnit.php
+++ b/PHPCI/Plugin/PhpUnit.php
@@ -133,7 +133,7 @@ class PhpUnit implements PHPCI\Plugin, PHPCI\ZeroConfigPlugin
         }
 
         if (isset($options['coverage'])) {
-            $this->coverage = " --coverage-html {$options['coverage']} ";
+            $this->coverage = ' --coverage-html ' . $this->phpci->interpolate($options['coverage']) . ' ';
         }
     }
 
diff --git a/PHPCI/Plugin/Wipe.php b/PHPCI/Plugin/Wipe.php
index 86e543b5..e6b619a0 100644
--- a/PHPCI/Plugin/Wipe.php
+++ b/PHPCI/Plugin/Wipe.php
@@ -43,7 +43,7 @@ class Wipe implements \PHPCI\Plugin
         $path               = $phpci->buildPath;
         $this->phpci        = $phpci;
         $this->build = $build;
-        $this->directory    = isset($options['directory']) ? $options['directory'] : $path;
+        $this->directory    = isset($options['directory']) ? $this->phpci->interpolate($options['directory']) : $path;
     }
 
     /**