diff --git a/src/modules/quizzes.js b/src/modules/quizzes.js
index 9c13297c..51b88786 100644
--- a/src/modules/quizzes.js
+++ b/src/modules/quizzes.js
@@ -61,7 +61,7 @@ function createQuizUrl(quizId, parameters, options, path) {
 
     // Pull a (answers) from parameters and transform
     if (answers && answers.length) {
-      answersParamString = `&${helpers.stringify({ a: answers.map((ans) => [...ans].join(',')) })}`;
+      answersParamString = `&${helpers.stringify({ a: answers.map((ans) => [...ans.map(encodeURIComponent)].join(',')) })}`;
     }
 
     // Pull page from parameters
diff --git a/src/types/quizzes.d.ts b/src/types/quizzes.d.ts
index 43ae4eb8..39141ca3 100644
--- a/src/types/quizzes.d.ts
+++ b/src/types/quizzes.d.ts
@@ -115,7 +115,7 @@ export interface QuizResultData extends Record<string, any> {
   variations: Record<string, any>[];
 }
 
-export type Question = SelectQuestion | OpenQuestion | CoverQuestion;
+export type Question = SelectQuestion | FilterValueQuestion | OpenQuestion | CoverQuestion;
 
 export interface BaseQuestion extends Record<string, any> {
   id: number;
@@ -125,6 +125,12 @@ export interface BaseQuestion extends Record<string, any> {
   images?: Nullable<QuestionImages>;
 }
 
+export interface FilterValueQuestion extends BaseQuestion {
+  type: 'single_filter_value' |'multiple_filter_values';
+  filter_name: string;
+  options: QuestionOption[];
+}
+
 export interface SelectQuestion extends BaseQuestion {
   type: 'single' | 'multiple';
   options: QuestionOption[];
diff --git a/src/types/tests/quizzes.test-d.ts b/src/types/tests/quizzes.test-d.ts
index 2d05c391..975b3fc1 100644
--- a/src/types/tests/quizzes.test-d.ts
+++ b/src/types/tests/quizzes.test-d.ts
@@ -293,7 +293,7 @@ expectAssignable<QuizResultsConfigResponse>({
         is_active: true,
         text: 'Sample response summary',
         items_separator: ',',
-        last_separator: 'and'
+        last_separator: 'and',
       },
     },
   },