diff --git a/UpdateStream.cc b/UpdateStream.cc
index d413422..d8e1085 100644
--- a/UpdateStream.cc
+++ b/UpdateStream.cc
@@ -12,6 +12,7 @@
 namespace pEp {
     namespace UpdateClient {
         using namespace CryptoPP;
+        using byte = CryptoPP::byte;
 
         UpdateDevice::UpdateDevice(const product p)
             : _https({HTTPSDevice()}, ios::binary), _p(p),