diff --git a/library/axi_ad6676/axi_ad6676.v b/library/axi_ad6676/axi_ad6676.v
index 535aa7fbc..e611b9826 100644
--- a/library/axi_ad6676/axi_ad6676.v
+++ b/library/axi_ad6676/axi_ad6676.v
@@ -37,8 +37,7 @@
 
 module axi_ad6676 #(
 
-  parameter ID = 0,
-  parameter IO_DELAY_GROUP = "adc_if_delay_group") (
+  parameter ID = 0) (
 
   // jesd interface
   // rx_clk is (line-rate/40)
diff --git a/library/axi_ad9625/axi_ad9625.v b/library/axi_ad9625/axi_ad9625.v
index 1f50df7ff..40fa34953 100644
--- a/library/axi_ad9625/axi_ad9625.v
+++ b/library/axi_ad9625/axi_ad9625.v
@@ -37,8 +37,7 @@
 
 module axi_ad9625 #(
 
-  parameter ID = 0,
-  parameter IO_DELAY_GROUP = "adc_if_delay_group") (
+  parameter ID = 0) (
 
   // jesd interface
   // rx_clk is (line-rate/40)
diff --git a/library/axi_ad9680/axi_ad9680.v b/library/axi_ad9680/axi_ad9680.v
index 72df22805..e80c3718b 100644
--- a/library/axi_ad9680/axi_ad9680.v
+++ b/library/axi_ad9680/axi_ad9680.v
@@ -37,8 +37,7 @@
 
 module axi_ad9680 #(
 
-  parameter ID = 0,
-  parameter IO_DELAY_GROUP = "adc_if_delay_group") (
+  parameter ID = 0) (
 
   // jesd interface 
   // rx_clk is (line-rate/40)