diff --git a/src/hash-helper.h b/src/hash-helper.h
index ea12f30..d4f750d 100644
--- a/src/hash-helper.h
+++ b/src/hash-helper.h
@@ -26,6 +26,7 @@
 #include <iostream>
 #include <boost/shared_ptr.hpp>
 #include <boost/exception/all.hpp>
+#include <boost/filesystem.hpp>
 
 // Other options: VP_md2, EVP_md5, EVP_sha, EVP_sha1, EVP_sha256, EVP_dss, EVP_dss1, EVP_mdc2, EVP_ripemd160
 #define HASH_FUNCTION EVP_sha256
@@ -50,7 +51,7 @@
   FromString (const std::string &hashInTextEncoding);
 
   static HashPtr
-  FromFileContent (const std::string &hashInTextEncoding);
+  FromFileContent (const boost::filesystem::path &fileName);
   
   ~Hash ()
   {