diff --git a/rtl/eth/taxi_axis_baser_tx_64.sv b/rtl/eth/taxi_axis_baser_tx_64.sv
index 1e2d878..cd4df2a 100644
--- a/rtl/eth/taxi_axis_baser_tx_64.sv
+++ b/rtl/eth/taxi_axis_baser_tx_64.sv
@@ -240,8 +240,7 @@ for (genvar n = 0; n < 8; n = n + 1) begin : crc
 
 end
 
-function [2:0] keep2empty;
-    input [7:0] k;
+function [2:0] keep2empty(input [7:0] k);
     casez (k)
         8'bzzzzzzz0: keep2empty = 3'd7;
         8'bzzzzzz01: keep2empty = 3'd7;
diff --git a/rtl/eth/taxi_axis_xgmii_tx_32.sv b/rtl/eth/taxi_axis_xgmii_tx_32.sv
index 553a3cb..f749229 100644
--- a/rtl/eth/taxi_axis_xgmii_tx_32.sv
+++ b/rtl/eth/taxi_axis_xgmii_tx_32.sv
@@ -178,8 +178,7 @@ for (genvar n = 0; n < 4; n = n + 1) begin : crc
 
 end
 
-function [1:0] keep2empty;
-    input [3:0] k;
+function [1:0] keep2empty(input [3:0] k);
     casez (k)
         4'bzzz0: keep2empty = 2'd3;
         4'bzz01: keep2empty = 2'd3;
diff --git a/rtl/eth/taxi_axis_xgmii_tx_64.sv b/rtl/eth/taxi_axis_xgmii_tx_64.sv
index e92fb9c..0d50a67 100644
--- a/rtl/eth/taxi_axis_xgmii_tx_64.sv
+++ b/rtl/eth/taxi_axis_xgmii_tx_64.sv
@@ -186,8 +186,7 @@ for (genvar n = 0; n < 8; n = n + 1) begin : crc
 
 end
 
-function [2:0] keep2empty;
-    input [7:0] k;
+function [2:0] keep2empty(input [7:0] k);
     casez (k)
         8'bzzzzzzz0: keep2empty = 3'd7;
         8'bzzzzzz01: keep2empty = 3'd7;