diff --git a/library/common/ad_edge_detect.v b/library/common/ad_edge_detect.v
index 12f5ae2c7..ddbc7319e 100644
--- a/library/common/ad_edge_detect.v
+++ b/library/common/ad_edge_detect.v
@@ -44,8 +44,8 @@ module ad_edge_detect #(
   input                   clk,
   input                   rst,
 
-  input                   in,
-  output  reg             out);
+  input                   signal_in,
+  output  reg             signal_out);
 
 
   localparam  POS_EDGE = 0;
@@ -60,21 +60,21 @@ module ad_edge_detect #(
       ff_m1 <= 0;
       ff_m2 <= 0;
     end else begin
-      ff_m1 <= in;
+      ff_m1 <= signal_in;
       ff_m2 <= ff_m1;
     end
   end
 
   always @(posedge clk) begin
     if (rst == 1) begin
-      out <= 1'b0;
+      signal_out <= 1'b0;
     end else begin
       if (EDGE == POS_EDGE) begin
-        out <= ff_m1 & ~ff_m2;
+        signal_out <= ff_m1 & ~ff_m2;
       end else if (EDGE == NEG_EDGE) begin
-        out <= ~ff_m1 & ff_m2;
+        signal_out <= ~ff_m1 & ff_m2;
       end else begin
-        out <= ff_m1 ^ ff_m2;
+        signal_out <= ff_m1 ^ ff_m2;
       end
     end
   end