diff --git a/urbackupserver/InternetServiceConnector.cpp b/urbackupserver/InternetServiceConnector.cpp
index 6d964e99..0cb78237 100644
--- a/urbackupserver/InternetServiceConnector.cpp
+++ b/urbackupserver/InternetServiceConnector.cpp
@@ -906,8 +906,8 @@ std::string InternetServiceConnector::generateOnetimeToken(const std::string &cl
 	std::string ret;
 	ret.resize(sizeof(unsigned int)+token.token.size());
 	token_id=little_endian(token_id);
-	memcpy((char*)ret.data(), &token_id, sizeof(unsigned int));
-	memcpy((char*)ret.data()+sizeof(unsigned int), token.token.data(), token.token.size());
+	memcpy(&ret[0], &token_id, sizeof(unsigned int));
+	memcpy(&ret[sizeof(unsigned int)], token.token.data(), token.token.size());
 	return ret;
 }