diff --git a/top/firmware/hdl/emp_payload.vhd b/top/firmware/hdl/emp_payload.vhd
index daf1a7821f29f45eab56b26fddde4297fe320da0..f0ebbcb4fb30781cbac9c8373ba5e21db77893b6 100644
--- a/top/firmware/hdl/emp_payload.vhd
+++ b/top/firmware/hdl/emp_payload.vhd
@@ -308,7 +308,7 @@ pHistogram: process(clk_p)
 begin
     if rising_edge(clk_p) then
         if stubs(0).valid = '1' and histogram_enable = '1' then
-            if stubs0).data(50) = '0' then
+            if stubs(0).data(50) = '0' then
                 hist_l0_0_stub <= stubs(0);
                 hist_l0_1_stub <= LWORD_NULL;
             else