diff -r e07e6850d79b helper/ccn-client-helper.cc
--- a/helper/ccn-client-helper.cc	Thu Nov 28 17:53:06 2013 +0100
+++ b/helper/ccn-client-helper.cc	Mon Dec 02 16:38:11 2013 +0100
@@ -176,4 +176,15 @@
     }
   CopyFile (from, vto);
 }
+
+/**
+ * Reset environmental variables for the main binary for this application.
+ */
+void 
+CcnClientHelper::ResetEnvironment (void)
+{
+  m_files.clear();
+  DceApplicationHelper::ResetEnvironment();
 }
+
+}
diff -r e07e6850d79b helper/ccn-client-helper.h
--- a/helper/ccn-client-helper.h	Thu Nov 28 17:53:06 2013 +0100
+++ b/helper/ccn-client-helper.h	Mon Dec 02 16:38:11 2013 +0100
@@ -14,6 +14,11 @@
   virtual ApplicationContainer Install (NodeContainer c);
   void AddFile (std::string from, std::string to);
 
+  /**
+   * Reset environmental variables for the main binary for this application.
+   */
+  void ResetEnvironment (void);
+
 private:
   std::string GetKeystoreDir (void);
   void CreateKeystore ();
@@ -23,6 +28,8 @@
 
   void CopyRealFileToVirtual (int nodeId, std::string from, std::string to);
 
+
 };
+
 }
 #endif // CCN_HELPER_H