diff --git a/fairmq/nanomsg/FairMQSocketNN.cxx b/fairmq/nanomsg/FairMQSocketNN.cxx
index cb2d6291..f3d76810 100644
--- a/fairmq/nanomsg/FairMQSocketNN.cxx
+++ b/fairmq/nanomsg/FairMQSocketNN.cxx
@@ -219,6 +219,8 @@ int FairMQSocketNN::GetConstant(const string& constant)
 
     if (constant == "linger")
         return NN_LINGER;
+    if (constant == "no-block")
+        return NN_DONTWAIT;
 
     return -1;
 }
diff --git a/fairmq/zeromq/FairMQSocketZMQ.cxx b/fairmq/zeromq/FairMQSocketZMQ.cxx
index d146a2ef..efdff2c9 100644
--- a/fairmq/zeromq/FairMQSocketZMQ.cxx
+++ b/fairmq/zeromq/FairMQSocketZMQ.cxx
@@ -246,6 +246,8 @@ int FairMQSocketZMQ::GetConstant(const string& constant)
 
     if (constant == "linger")
         return ZMQ_LINGER;
+    if (constant == "no-block")
+        return ZMQ_DONTWAIT;
 
     return -1;
 }