diff --git a/include/libtorrent/bt_peer_connection.hpp b/include/libtorrent/bt_peer_connection.hpp
index 81a645cd6..dbc93fd0c 100644
--- a/include/libtorrent/bt_peer_connection.hpp
+++ b/include/libtorrent/bt_peer_connection.hpp
@@ -370,7 +370,7 @@ private:
 		// the peer indicated that it supports the
 		// extension protocol
 		bool m_supports_extensions;
-		char m_reserved_bits[20];
+		char m_reserved_bits[8];
 #endif
 		bool m_supports_dht_port;
 		bool m_supports_fast;
diff --git a/src/bt_peer_connection.cpp b/src/bt_peer_connection.cpp
index c7767c969..a8b208a61 100644
--- a/src/bt_peer_connection.cpp
+++ b/src/bt_peer_connection.cpp
@@ -2463,7 +2463,7 @@ namespace libtorrent
 #endif
 
 #ifndef DISABLE_EXTENSIONS
-			std::memcpy(m_reserved_bits, recv_buffer.begin, 20);
+			std::memcpy(m_reserved_bits, recv_buffer.begin, 8);
 			if ((recv_buffer[5] & 0x10))
 				m_supports_extensions = true;
 #endif