diff --git a/src/bin/dhcp4/dhcp4.spec b/src/bin/dhcp4/dhcp4.spec
index 84c28d75fe..f8bb336276 100644
--- a/src/bin/dhcp4/dhcp4.spec
+++ b/src/bin/dhcp4/dhcp4.spec
@@ -10,10 +10,16 @@
         "item_default": [],
         "list_item_spec":
         {
-          "item_name": "hooks-library",
-          "item_type": "string",
+          "item_name": "hooks-library-spec",
+          "item_type": "map",
           "item_optional": false,
-          "item_default": ""
+          "map_item_spec": [
+             {
+                "item_name": "library",
+                "item_type": "string"
+                "item_optional": false
+             }
+          ]
         }
       },
 
diff --git a/src/bin/dhcp6/dhcp6.spec b/src/bin/dhcp6/dhcp6.spec
index f24d15f20a..65a40e3f81 100644
--- a/src/bin/dhcp6/dhcp6.spec
+++ b/src/bin/dhcp6/dhcp6.spec
@@ -10,10 +10,16 @@
         "item_default": [],
         "list_item_spec":
         {
-          "item_name": "hooks-library",
-          "item_type": "string",
+          "item_name": "hooks-library-spec",
+          "item_type": "map",
           "item_optional": false,
-          "item_default": ""
+          "map_item_spec": [
+             {
+                "item_name": "library",
+                "item_type": "string"
+                "item_optional": false
+             }
+          ]
         }
       },