diff --git a/packages/rulesets/src/asyncapi/functions/asyncApi2ChannelParameters.ts b/packages/rulesets/src/asyncapi/functions/asyncApi2ChannelParameters.ts
index 24897fc64..4302b33a3 100644
--- a/packages/rulesets/src/asyncapi/functions/asyncApi2ChannelParameters.ts
+++ b/packages/rulesets/src/asyncapi/functions/asyncApi2ChannelParameters.ts
@@ -8,7 +8,15 @@ import type { IFunctionResult } from '@stoplight/spectral-core';
 
 export default createRulesetFunction<{ parameters: Record<string, unknown> }, null>(
   {
-    input: null,
+    input: {
+      type: 'object',
+      properties: {
+        parameters: {
+          type: 'object',
+        }
+      },
+      required: ['parameters'],
+    },
     options: null,
   },
   function asyncApi2ChannelParameters(targetVal, _, ctx) {
diff --git a/packages/rulesets/src/asyncapi/functions/asyncApi2ServerVariables.ts b/packages/rulesets/src/asyncapi/functions/asyncApi2ServerVariables.ts
index 2d7023a9d..e876cced5 100644
--- a/packages/rulesets/src/asyncapi/functions/asyncApi2ServerVariables.ts
+++ b/packages/rulesets/src/asyncapi/functions/asyncApi2ServerVariables.ts
@@ -8,7 +8,18 @@ import type { IFunctionResult } from '@stoplight/spectral-core';
 
 export default createRulesetFunction<{ url: string; variables: Record<string, unknown> }, null>(
   {
-    input: null,
+    input: {
+      type: 'object',
+      properties: {
+        url: {
+          type: 'string',
+        },
+        variables: {
+          type: 'object',
+        }
+      },
+      required: ['url', 'variables'],
+    },
     options: null,
   },
   function asyncApi2ServerVariables(targetVal, _, ctx) {