diff --git a/django_filters/rest_framework/backends.py b/django_filters/rest_framework/backends.py
index 835a67f9a..60d78e8a5 100644
--- a/django_filters/rest_framework/backends.py
+++ b/django_filters/rest_framework/backends.py
@@ -105,7 +105,9 @@ def to_html(self, request, queryset, view):
         return template.render(context, request)
 
     def get_coreschema_field(self, field):
-        if isinstance(field, filters.NumberFilter):
+        if isinstance(field, filters.BaseCSVFilter):
+            field_cls = compat.coreschema.String
+        elif isinstance(field, filters.NumberFilter):
             field_cls = compat.coreschema.Number
         else:
             field_cls = compat.coreschema.String