diff --git a/gst-libs/ext/mplex/inputstrm.cc b/gst-libs/ext/mplex/inputstrm.cc
index 4a19724a57..64edec54fd 100644
--- a/gst-libs/ext/mplex/inputstrm.cc
+++ b/gst-libs/ext/mplex/inputstrm.cc
@@ -61,6 +61,7 @@ MuxStream::BufferSizeCode ()
     return buffer_size / 128;
   else
     assert (false);
+  return 0;
 }