diff --git a/lib/api/institutions.js b/lib/api/institutions.js
index c95d2f5..dc3c537 100644
--- a/lib/api/institutions.js
+++ b/lib/api/institutions.js
@@ -17,12 +17,12 @@ export default class InstitutionApi {
     /**
      * Get list of institutions
      * @param {Object} params
-     * @param {string} params.country
+     * @param {string|undefined} params.country
      * @returns institution data array
      */ 
     getInstitutions({country}) {
         return this.#client.request({
-            endpoint: `${this.#endpoint}/?country=${country}`
+            endpoint: `${this.#endpoint}${country ? `?country=${country}` : ""}`
         });
     }
 
diff --git a/types/api/institutions.d.ts b/types/api/institutions.d.ts
index e586c66..c1cece4 100644
--- a/types/api/institutions.d.ts
+++ b/types/api/institutions.d.ts
@@ -14,7 +14,7 @@ export default class InstitutionApi {
      * @returns institution data array
      */
     getInstitutions({ country }: {
-        country: string;
+        country?: string;
     }): any;
     /***
      * Get single institution by id