diff --git a/src/h2load_http2_session.h b/src/h2load_http2_session.h
index 20046678..1c82b1d3 100644
--- a/src/h2load_http2_session.h
+++ b/src/h2load_http2_session.h
@@ -31,7 +31,7 @@
 
 namespace h2load {
 
-class Client;
+struct Client;
 
 class Http2Session : public Session {
 public:
diff --git a/src/h2load_spdy_session.h b/src/h2load_spdy_session.h
index e163ba78..860ec5af 100644
--- a/src/h2load_spdy_session.h
+++ b/src/h2load_spdy_session.h
@@ -31,7 +31,7 @@
 
 namespace h2load {
 
-class Client;
+struct Client;
 
 class SpdySession : public Session {
 public: