diff --git a/src/hdl/modules/qlaser_dacs_pulse_channel.vhdl b/src/hdl/modules/qlaser_dacs_pulse_channel.vhdl
index 74c7772..e2d1a39 100644
--- a/src/hdl/modules/qlaser_dacs_pulse_channel.vhdl
+++ b/src/hdl/modules/qlaser_dacs_pulse_channel.vhdl
@@ -178,7 +178,7 @@ begin
             if (cpu_wr = '1') and (cpu_sel = '1') then
             
                 -- 0 for pulse definition, 1 for waveform table
-                if (cpu_addr(9) = '1') then
+                if (cpu_addr(C_RAM_SELECT) = '1') then
 
                     ram_pulse_addra     <= (others=>'0');
                     ram_pulse_dina      <= (others=>'0');