diff --git a/lib/flow_control/burst_fnr_filter_impl.cc b/lib/flow_control/burst_fnr_filter_impl.cc
index 1aa6f5b..e665acf 100644
--- a/lib/flow_control/burst_fnr_filter_impl.cc
+++ b/lib/flow_control/burst_fnr_filter_impl.cc
@@ -70,7 +70,7 @@
         unsigned int frame_nr = be32toh(header->frame_number);
         
         if ((d_mode == FILTER_LESS_OR_EQUAL && frame_nr <= d_framenr)
-            || d_mode == FILTER_GREATER_OR_EQUAL && frame_nr >= d_framenr)
+            || (d_mode == FILTER_GREATER_OR_EQUAL && frame_nr >= d_framenr))
         {
             message_port_pub(pmt::mp("out"), msg);
         }