diff --git a/test/core/util/port.h b/test/core/util/port.h
index d06f04731e2..0ba895af433 100644
--- a/test/core/util/port.h
+++ b/test/core/util/port.h
@@ -34,6 +34,10 @@
 #ifndef __GRPC_TEST_UTIL_PORT_H__
 #define __GRPC_TEST_UTIL_PORT_H__
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* pick a port number that is currently unused by either tcp or udp. return
    0 on failure. */
 int grpc_pick_unused_port();
@@ -41,4 +45,8 @@ int grpc_pick_unused_port();
    on failure. */
 int grpc_pick_unused_port_or_die();
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif  /* __GRPC_TEST_UTIL_PORT_H__ */