diff --git a/bindings/c/zmq.h b/bindings/c/zmq.h
index a65926ef..ff94dd4a 100644
--- a/bindings/c/zmq.h
+++ b/bindings/c/zmq.h
@@ -63,6 +63,9 @@ extern "C" {
 #ifndef EADDRNOTAVAIL
 #define EADDRNOTAVAIL (ZMQ_HAUSNUMERO + 6)
 #endif
+#ifndef ECONNREFUSED
+#define ECONNREFUSED (ZMQ_HAUSNUMERO + 7)
+#endif
 
 //  Native 0MQ error codes.
 #define EMTHREAD (ZMQ_HAUSNUMERO + 50)
diff --git a/builds/msvc/libzmq/libzmq.vcproj b/builds/msvc/libzmq/libzmq.vcproj
index 8927fa28..e575d67c 100644
--- a/builds/msvc/libzmq/libzmq.vcproj
+++ b/builds/msvc/libzmq/libzmq.vcproj
@@ -181,6 +181,10 @@
 				RelativePath="..\..\..\src\dispatcher.cpp"
 				>
 			</File>
+			<File
+				RelativePath="..\..\..\src\downstream.cpp"
+				>
+			</File>
 			<File
 				RelativePath="..\..\..\src\epoll.cpp"
 				>
@@ -289,6 +293,10 @@
 				RelativePath="..\..\..\src\thread.cpp"
 				>
 			</File>
+			<File
+				RelativePath="..\..\..\src\upstream.cpp"
+				>
+			</File>
 			<File
 				RelativePath="..\..\..\src\uuid.cpp"
 				>
@@ -375,6 +383,10 @@
 				RelativePath="..\..\..\src\encoder.hpp"
 				>
 			</File>
+			<File
+				RelativePath="..\..\..\src\downstream.hpp"
+				>
+			</File>
 			<File
 				RelativePath="..\..\..\src\epoll.hpp"
 				>
@@ -531,6 +543,10 @@
 				RelativePath="..\..\..\src\thread.hpp"
 				>
 			</File>
+			<File
+				RelativePath="..\..\..\src\upstream.hpp"
+				>
+			</File>
 			<File
 				RelativePath="..\..\..\src\uuid.hpp"
 				>