diff --git a/common/firmware/hdl/TrackFinder.vhd b/common/firmware/hdl/TrackFinder.vhd
index 7c066adbf278751f30f00cbf3425392ee9efff38..e11a074e23abc71ae0fbb1c42fad081553e50f18 100644
--- a/common/firmware/hdl/TrackFinder.vhd
+++ b/common/firmware/hdl/TrackFinder.vhd
@@ -72,7 +72,7 @@ begin
                     end if;
                 end loop;
             end if;
-            valid_event <= and_reduce(valid_event_array) and headder_start;
+            valid_event <= and_reduce(valid_event_array) and header_start;
 
             if valid_event then
                 histogram_input.valid <= '1';