diff --git a/include/zmq.h b/include/zmq.h
index aaa04305..f28d5456 100644
--- a/include/zmq.h
+++ b/include/zmq.h
@@ -215,17 +215,6 @@ ZMQ_EXPORT int zmq_recv (void *s, void *buf, size_t len, int flags);
 ZMQ_EXPORT int zmq_sendmsg (void *s, zmq_msg_t *msg, int flags);
 ZMQ_EXPORT int zmq_recvmsg (void *s, zmq_msg_t *msg, int flags);
 
-// XSI vector I/O
-#if ZMQ_HAVE_UIO
-#include <sys/uio.h>
-#else
-struct iovec 
-{
-    void *iov_base;
-    size_t iov_len;
-};
-#endif
-
 ZMQ_EXPORT int zmq_sendv (void *s, struct iovec *iov, size_t count, int flags);
 ZMQ_EXPORT int zmq_recvmmsg (void *s, struct iovec *iov, size_t *count, int flags);
 
diff --git a/src/zmq.cpp b/src/zmq.cpp
index c70cfa6b..e4179127 100644
--- a/src/zmq.cpp
+++ b/src/zmq.cpp
@@ -51,6 +51,18 @@
 #endif
 
 
+// XSI vector I/O
+#if ZMQ_HAVE_UIO
+#include <sys/uio.h>
+#else
+struct iovec 
+{
+    void *iov_base;
+    size_t iov_len;
+};
+#endif
+
+
 #include <string.h>
 #include <errno.h>
 #include <stdlib.h>