diff --git a/src/hdl/fir.vhd b/src/hdl/fir.vhd
index b5821df1dfcc474f16ee72acfe0593c04c16b161..52ee06ec58201f6861c4c07a7274648d17b1f8e7 100644
--- a/src/hdl/fir.vhd
+++ b/src/hdl/fir.vhd
@@ -38,7 +38,7 @@ architecture myarch of fir is
   end component firUnit;
 
 
-  signal D_in, D_out : std_logic_vector(7 downto 0);
+  signal D_in, D_out : std_logic_vector(15 downto 0);
 
 begin  -- myarch