diff --git a/rtl/serv_csr.v b/rtl/serv_csr.v
index 3b4a6ef..9db26bb 100644
--- a/rtl/serv_csr.v
+++ b/rtl/serv_csr.v
@@ -66,7 +66,7 @@ module serv_csr
 
    assign o_q = csr_out;
 
-   wire 	o_timer_irq_en = mstatus_mie & mie_mtie;
+   assign 	o_timer_irq_en = mstatus_mie & mie_mtie;
 
    always @(posedge i_clk) begin
       if (i_en & (i_cnt == 3) & (i_csr_sel == CSR_SEL_MSTATUS))
diff --git a/rtl/shift_reg.v b/rtl/shift_reg.v
index 3a4e51b..0b3d504 100644
--- a/rtl/shift_reg.v
+++ b/rtl/shift_reg.v
@@ -1,5 +1,6 @@
 module shift_reg
-  #(parameter LEN = 0)
+  #(parameter LEN = 0,
+    parameter INIT = 0)
   (
    input wire 		 clk,
    input wire 		 i_en,
@@ -7,8 +8,6 @@ module shift_reg
    output wire 		 o_q,
    output wire [LEN-2:0] o_par);
 
-   parameter INIT = 0;
-
    reg [LEN-1:0] 	 data = INIT;
    assign o_q = data[0];
    assign o_par = data[LEN-1:1];