diff --git a/definitions/3.0.0/channel.json b/definitions/3.0.0/channel.json
index bf715ede..17d9d9d1 100644
--- a/definitions/3.0.0/channel.json
+++ b/definitions/3.0.0/channel.json
@@ -15,10 +15,7 @@
       "$ref": "http://asyncapi.com/definitions/3.0.0/channelMessages.json"
     },
     "parameters": {
-      "type": "object",
-      "additionalProperties": {
-        "$ref": "http://asyncapi.com/definitions/3.0.0/parameter.json"
-      }
+      "$ref": "http://asyncapi.com/definitions/3.0.0/parameters.json"
     },
     "title": {
       "type": "string",
diff --git a/definitions/3.0.0/parameters.json b/definitions/3.0.0/parameters.json
index 8bb0178b..19193781 100644
--- a/definitions/3.0.0/parameters.json
+++ b/definitions/3.0.0/parameters.json
@@ -1,7 +1,14 @@
 {
   "type": "object",
   "additionalProperties": {
-    "$ref": "http://asyncapi.com/definitions/3.0.0/parameter.json"
+    "oneOf": [
+      {
+        "$ref": "http://asyncapi.com/definitions/3.0.0/Reference.json"
+      },
+      {
+        "$ref": "http://asyncapi.com/definitions/3.0.0/parameter.json"
+      }
+    ]
   },
   "description": "JSON objects describing re-usable channel parameters.",
   "$schema": "http://json-schema.org/draft-07/schema#",
diff --git a/definitions/3.0.0/serverVariables.json b/definitions/3.0.0/serverVariables.json
index d4946d79..69015771 100644
--- a/definitions/3.0.0/serverVariables.json
+++ b/definitions/3.0.0/serverVariables.json
@@ -1,7 +1,14 @@
 {
   "type": "object",
   "additionalProperties": {
-    "$ref": "http://asyncapi.com/definitions/3.0.0/serverVariable.json"
+    "oneOf": [
+      {
+        "$ref": "http://asyncapi.com/definitions/3.0.0/Reference.json"
+      },
+      {
+        "$ref": "http://asyncapi.com/definitions/3.0.0/serverVariable.json"
+      }
+    ]
   },
   "$schema": "http://json-schema.org/draft-07/schema#",
   "$id": "http://asyncapi.com/definitions/3.0.0/serverVariables.json"