1 files changed, 4 insertions, 1 deletions
diff --git a/src/util.h b/src/util.h
index 3d25364505..b922545b9b 100644
--- a/src/util.h
+++ b/src/util.h
@@ -7,6 +7,8 @@
 
 #include "uint256.h"
 
+#include <stdarg.h>
+
 #ifndef WIN32
 #include <sys/types.h>
 #include <sys/time.h>
@@ -298,7 +300,8 @@ std::string HexStr(const T itbegin, const T itend, bool fSpaces=false)
     return rv;
 }
 
-inline std::string HexStr(const std::vector<unsigned char>& vch, bool fSpaces=false)
+template<typename T>
+inline std::string HexStr(const T& vch, bool fSpaces=false)
 {
     return HexStr(vch.begin(), vch.end(), fSpaces);
 }