diff --git a/libgrive/src/http/Agent.cc b/libgrive/src/http/Agent.cc
index ba04846..39276ac 100644
--- a/libgrive/src/http/Agent.cc
+++ b/libgrive/src/http/Agent.cc
@@ -25,6 +25,11 @@ namespace gr {
 
 namespace http {
 
+Agent::Agent()
+{
+	mMaxUpload = mMaxDownload = 0;
+}
+
 long Agent::Put(
 	const std::string&	url,
 	const std::string&	data,
diff --git a/libgrive/src/http/Agent.hh b/libgrive/src/http/Agent.hh
index ce1883b..8268e19 100644
--- a/libgrive/src/http/Agent.hh
+++ b/libgrive/src/http/Agent.hh
@@ -38,6 +38,7 @@ protected:
 	unsigned mMaxUpload, mMaxDownload ;
 
 public :
+	Agent() ;
 	virtual ~Agent() {}
 
 	virtual ResponseLog* GetLog() const = 0 ;
diff --git a/libgrive/src/http/CurlAgent.cc b/libgrive/src/http/CurlAgent.cc
index 3a27955..3bfdfca 100644
--- a/libgrive/src/http/CurlAgent.cc
+++ b/libgrive/src/http/CurlAgent.cc
@@ -72,7 +72,7 @@ struct CurlAgent::Impl
 
 static struct curl_slist* SetHeader( CURL* handle, const Header& hdr );
 
-CurlAgent::CurlAgent() :
+CurlAgent::CurlAgent() : Agent(),
 	m_pimpl( new Impl )
 {
 	m_pimpl->curl = ::curl_easy_init();
diff --git a/libgrive/src/protocol/AuthAgent.cc b/libgrive/src/protocol/AuthAgent.cc
index 65665f7..f2f59d6 100644
--- a/libgrive/src/protocol/AuthAgent.cc
+++ b/libgrive/src/protocol/AuthAgent.cc
@@ -32,6 +32,7 @@ namespace gr {
 using namespace http ;
 
 AuthAgent::AuthAgent( OAuth2& auth, Agent *real_agent ) :
+	Agent(),
 	m_auth	( auth ),
 	m_agent	( real_agent )
 {