diff --git a/top/muone/firmware/hdl/emp_payload.vhd b/top/muone/firmware/hdl/emp_payload.vhd
index ae581ea4ba966287c7fe33204709a7788ebe0d53..d111d2fc22d1d6927a4f04d0a25eff5fd1b204a7 100644
--- a/top/muone/firmware/hdl/emp_payload.vhd
+++ b/top/muone/firmware/hdl/emp_payload.vhd
@@ -113,6 +113,7 @@ architecture rtl of emp_payload is
     signal ecal_link_data             : tDaqEcalLinkDataArray;
     signal ecal_data                  : ldata(cNumberOfEcalOutputLinks - 1 downto 0);
 
+    signal ttrig                      : lword := LWORD_NULL;
 
 
 begin