diff --git a/packages/sdk-rtl/src/transport.spec.ts b/packages/sdk-rtl/src/transport.spec.ts
index 77444127e..ee8e2224a 100644
--- a/packages/sdk-rtl/src/transport.spec.ts
+++ b/packages/sdk-rtl/src/transport.spec.ts
@@ -61,5 +61,8 @@ describe('Transport', () => {
     expect(encodeParam('foo/bar')).toEqual('foo%2Fbar')
     expect(encodeParam(true)).toEqual('true')
     expect(encodeParam(2.3)).toEqual('2.3')
+    expect(encodeParam({ created_date: 'this year to second' })).toEqual(
+      '{"created_date":"this year to second"}'
+    )
   })
 })
diff --git a/packages/sdk-rtl/src/transport.ts b/packages/sdk-rtl/src/transport.ts
index f7624de09..20959c36b 100644
--- a/packages/sdk-rtl/src/transport.ts
+++ b/packages/sdk-rtl/src/transport.ts
@@ -380,7 +380,9 @@ export function encodeParam(value: any) {
   if (value instanceof Date) {
     value = value.toISOString()
   }
-  let encoded = value.toString()
+  // check for object type to prevent "[object Object]" as the value.toString()
+  let encoded =
+    typeof value === 'object' ? JSON.stringify(value) : value.toString()
 
   // decodeURIComponent throws URIError if there is a % character
   // without it being part of an encoded