1 files changed, 4 insertions, 0 deletions
diff --git a/src/sub.cpp b/src/sub.cpp
index c8ffd2e..2a1454a 100644
--- a/src/sub.cpp
+++ b/src/sub.cpp
@@ -25,6 +25,10 @@ zmq::sub_t::sub_t (class ctx_t *parent_, uint32_t tid_) :
     xsub_t (parent_, tid_)
 {
     options.type = ZMQ_SUB;
+
+    //  Switch filtering messages on (as opposed to XSUB which where the
+    //  filtering is off).
+    options.filter = true;
 }
 
 zmq::sub_t::~sub_t ()