diff --git a/src/hash-string-converter.cc b/src/hash-string-converter.cc
index 1c9a656..2961069 100644
--- a/src/hash-string-converter.cc
+++ b/src/hash-string-converter.cc
@@ -118,7 +118,7 @@
       return;
     }
 
-  unsigned char *m_buf = new unsigned char [EVP_MAX_MD_SIZE];
+  m_buf = new unsigned char [EVP_MAX_MD_SIZE];
   
   unsigned char *end = copy (string_to_binary (hashInTextEncoding.begin ()),
                             string_to_binary (hashInTextEncoding.end ()),