1 files changed, 2 insertions, 2 deletions
diff --git a/src/app_thread.cpp b/src/app_thread.cpp
index 666116f..69e0942 100644
--- a/src/app_thread.cpp
+++ b/src/app_thread.cpp
@@ -191,8 +191,8 @@ zmq::socket_base_t *zmq::app_thread_t::create_socket (int type_)
         s = new (std::nothrow) downstream_t (this);
         break;
     default:
-        //  TODO: This should be EINVAL.
-        zmq_assert (false);
+        errno = EINVAL;
+        return NULL;
     }
     zmq_assert (s);