diff --git a/epan/dissectors/packet-dtn.c b/epan/dissectors/packet-dtn.c
index 1b01c770b9..bfbb4bae37 100644
--- a/epan/dissectors/packet-dtn.c
+++ b/epan/dissectors/packet-dtn.c
@@ -350,10 +350,10 @@ static const value_string packet_type_vals[] = {
 
 /* Refuse-Bundle Reason-Code Flags as per RFC-7242: Section-5.4 */
 static const value_string refuse_bundle_reason_code[] = {
-    {((TCP_REFUSE_BUNDLE_REASON_UNKNOWN>>4)         & 0x0F), "Reason for refusal is unknown"},
-    {((TCP_REFUSE_BUNDLE_REASON_RX_COMPLETE>>4)     & 0x0F), "Complete Bundle Received"},
-    {((TCP_REFUSE_BUNDLE_REASON_RX_EXHAUSTED>>4)    & 0x0F), "Receiver's resources exhausted"},
-    {((TCP_REFUSE_BUNDLE_REASON_RX_RETRANSMIT>>4)   & 0x0F), "Receiver expects re-transmission of bundle"},
+    {TCP_REFUSE_BUNDLE_REASON_UNKNOWN,       "Reason for refusal is unknown"},
+    {TCP_REFUSE_BUNDLE_REASON_RX_COMPLETE,   "Complete Bundle Received"},
+    {TCP_REFUSE_BUNDLE_REASON_RX_EXHAUSTED,  "Receiver's resources exhausted"},
+    {TCP_REFUSE_BUNDLE_REASON_RX_RETRANSMIT, "Receiver expects re-transmission of bundle"},
     {0, NULL}
 };
 
@@ -3202,7 +3202,7 @@ proto_register_bundle(void)
         },
         {&hf_dtn_refuse_bundle_reason_code,
          {"Reason-Code", "tcpcl.refuse.reason_code",
-          FT_UINT8, BASE_DEC, VALS(refuse_bundle_reason_code), 0xF0, NULL, HFILL}
+          FT_UINT8, BASE_DEC, VALS(refuse_bundle_reason_code), 0x0F, NULL, HFILL}
         },
         {&hf_tcp_convergence_data_procflags,
          {"TCP Convergence Data Flags", "tcpcl.data.proc.flag",