diff --git a/test/integration/scenario/http.go b/test/integration/scenario/http.go
index 6fd47b2b..f9257798 100644
--- a/test/integration/scenario/http.go
+++ b/test/integration/scenario/http.go
@@ -29,14 +29,16 @@ func doRequest(method, url string, headers map[string]string, body io.Reader) (*
 	return resp, nil
 }
 
-func doFormDataRequest(method, url string, fields map[string]string, files map[string][]string, headers map[string]string) (*http.Response, error) {
+func doFormDataRequest(method, url string, fields map[string][]string, files map[string][]string, headers map[string]string) (*http.Response, error) {
 	var b bytes.Buffer
 	writer := multipart.NewWriter(&b)
 
-	for name, value := range fields {
-		err := writer.WriteField(name, value)
-		if err != nil {
-			return nil, fmt.Errorf("write field %q: %w", name, err)
+	for name, values := range fields {
+		for _, value := range values {
+			err := writer.WriteField(name, value)
+			if err != nil {
+				return nil, fmt.Errorf("write field %q: %w", name, err)
+			}
 		}
 	}
 
diff --git a/test/integration/scenario/scenario.go b/test/integration/scenario/scenario.go
index 69e667c1..9b8cd428 100644
--- a/test/integration/scenario/scenario.go
+++ b/test/integration/scenario/scenario.go
@@ -208,7 +208,7 @@ func (s *scenario) iMakeARequestToGotenbergWithTheFollowingFormDataAndHeaders(ct
 		return errors.New("no Gotenberg container")
 	}
 
-	fields := make(map[string]string)
+	fields := make(map[string][]string)
 	files := make(map[string][]string)
 	headers := make(map[string]string)
 
@@ -220,10 +220,10 @@ func (s *scenario) iMakeARequestToGotenbergWithTheFollowingFormDataAndHeaders(ct
 		switch kind {
 		case "field":
 			if name == "downloadFrom" || name == "url" || name == "cookies" {
-				fields[name] = strings.ReplaceAll(value, "%d", fmt.Sprintf("%d", s.hostPort))
+				fields[name] = append(fields[name], strings.ReplaceAll(value, "%d", fmt.Sprintf("%d", s.hostPort)))
 				continue
 			}
-			fields[name] = value
+			fields[name] = append(fields[name], value)
 		case "file":
 			if strings.Contains(value, "teststore") {
 				if s.teststoreDir == "" {
@@ -363,7 +363,7 @@ func (s *scenario) iMakeConcurrentRequestsToGotenberg(ctx context.Context, count
 		return errors.New("no Gotenberg container")
 	}
 
-	fields := make(map[string]string)
+	fields := make(map[string][]string)
 	files := make(map[string][]string)
 	headers := make(map[string]string)
 
@@ -374,7 +374,7 @@ func (s *scenario) iMakeConcurrentRequestsToGotenberg(ctx context.Context, count
 
 		switch kind {
 		case "field":
-			fields[name] = value
+			fields[name] = append(fields[name], value)
 		case "file":
 			wd, err := os.Getwd()
 			if err != nil {