diff --git a/kdumpctl b/kdumpctl
index 989da79..104574b 100755
--- a/kdumpctl
+++ b/kdumpctl
@@ -1456,6 +1456,10 @@ _update_kernel_arg_in_grub_etc_default()
 {
 	local _para=$1 _val=$2 _para_val
 
+	if [[ $(uname -m) == s390x ]]; then
+		return
+	fi
+
 	if [[ -n $_val ]]; then
 		_para_val="$_para=$_val"
 	fi