diff --git a/CHANGELOG.md b/CHANGELOG.md
index c1bbab61..1c8813a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,12 @@
 
 All notable changes to this project will be documented in this file.
 
+# [3.13.26] - 19-06-2024
+
+### Fixes
+
+- Search string for `InPlayer.Payment.getSitePlans` appended without `?`
+
 # [3.13.25] - 17-06-2024
 
 ### Added
diff --git a/package.json b/package.json
index fc64e4fb..52bb5e0e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@inplayer-org/inplayer.js",
-  "version": "3.13.25",
+  "version": "3.13.26",
   "author": "InPlayer",
   "license": "MIT",
   "description": "A Javascript SDK for Inplayer's RESTful API",
diff --git a/src/constants/index.ts b/src/constants/index.ts
index b8ae9caf..7a7bb5c3 100644
--- a/src/constants/index.ts
+++ b/src/constants/index.ts
@@ -113,7 +113,7 @@ export const API = {
   getSitePlans: (siteId: string, plansIds: string[] = []) =>
     `/v3/sites/${siteId}/plans${
       plansIds.length
-        ? `q=id:(${plansIds.map((planId) => `"${planId}"`).join(' OR ')})`
+        ? `?q=id:(${plansIds.map((planId) => `"${planId}"`).join(' OR ')})`
         : ''
     }`,