1 files changed, 1 insertions, 1 deletions

diff --git a/lib/secret.cc b/lib/secret.cc
index d538890..3f1e39c 100644
--- a/lib/secret.cc
+++ b/lib/secret.cc
@@ -1,29 +1,29 @@
 #include <algorithm>
 #include <functional>
 #include <opkele/types.h>
 #include <opkele/exception.h>
 #include <opkele/util.h>
 
 namespace opkele {
     using namespace std;
 
     template<class __a1,class __a2,class __r>
         struct bitwise_xor : public binary_function<__a1,__a2,__r> {
             __r operator() (const __a1& a1,const __a2& a2) const {
-                return a1^a2;
+                return (__r)(a1^a2);
             }
         };
 
     void secret_t::enxor_to_base64(const unsigned char *key_d,string& rv) const {
         vector<unsigned char> tmp;
         transform(
                 begin(), end(),
                 key_d,
                 back_insert_iterator<vector<unsigned char> >(tmp),
                 bitwise_xor<unsigned char,unsigned char,unsigned char>() );
         rv = util::encode_base64(&(tmp.front()),tmp.size());
     }
 
     void secret_t::enxor_from_base64(const unsigned char *key_d,const string& b64) {
         clear();
         util::decode_base64(b64,*this);