diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index d6fb607163..d0b30ace1d 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -204,7 +204,7 @@ class BuiltinLookup(Lookup):
         lhs_sql = connection.ops.field_cast_sql(
             db_type, field_internal_type) % lhs_sql
         lhs_sql = connection.ops.lookup_cast(self.lookup_name, field_internal_type) % lhs_sql
-        return lhs_sql, params
+        return lhs_sql, list(params)
 
     def as_sql(self, compiler, connection):
         lhs_sql, params = self.process_lhs(compiler, connection)
diff --git a/docs/releases/1.8.6.txt b/docs/releases/1.8.6.txt
index acc8a8a93b..44380cded5 100644
--- a/docs/releases/1.8.6.txt
+++ b/docs/releases/1.8.6.txt
@@ -21,3 +21,5 @@ Bugfixes
 * Fixed incorrect queries when you have multiple ``ManyToManyField``\s on
   different models that have the same field name, point to the same model, and
   have their reverse relations disabled (:ticket:`25545`).
+
+* Allowed filtering over a ``RawSQL`` annotation (:ticket:`25506`).
diff --git a/tests/expressions/tests.py b/tests/expressions/tests.py
index 6ba962391a..2d8b17db2d 100644
--- a/tests/expressions/tests.py
+++ b/tests/expressions/tests.py
@@ -57,6 +57,18 @@ class BasicExpressionsTests(TestCase):
         )
         self.assertEqual(companies['result'], 2395)
 
+    def test_annotate_values_filter(self):
+        companies = Company.objects.annotate(
+            foo=RawSQL('%s', ['value']),
+        ).filter(foo='value').order_by('name')
+        self.assertQuerysetEqual(
+            companies, [
+                '<Company: Example Inc.>',
+                '<Company: Foobar Ltd.>',
+                '<Company: Test GmbH>',
+            ],
+        )
+
     def test_filter_inter_attribute(self):
         # We can filter on attribute relationships on same model obj, e.g.
         # find companies where the number of employees is greater