diff --git a/components/prefs/overlay_user_pref_store_unittest.cc b/components/prefs/overlay_user_pref_store_unittest.cc
index 52e9f986870788..fc977a1f7ad28d 100644
--- a/components/prefs/overlay_user_pref_store_unittest.cc
+++ b/components/prefs/overlay_user_pref_store_unittest.cc
@@ -139,7 +139,7 @@ TEST_F(OverlayUserPrefStoreTest, ModifyDictionaries) {
   EXPECT_TRUE(overlay_->GetMutableValue(regular_key, &modify));
   ASSERT_TRUE(modify);
   ASSERT_TRUE(modify->is_dict());
-  static_cast<DictionaryValue*>(modify)->SetInteger(regular_key, 42);
+  modify->SetIntPath(regular_key, 42);
 
   Value* original_in_underlay = nullptr;
   EXPECT_TRUE(underlay_->GetMutableValue(regular_key, &original_in_underlay));
diff --git a/components/sync_preferences/pref_model_associator_unittest.cc b/components/sync_preferences/pref_model_associator_unittest.cc
index fa0a652316fe58..6ded77e47bb7f3 100644
--- a/components/sync_preferences/pref_model_associator_unittest.cc
+++ b/components/sync_preferences/pref_model_associator_unittest.cc
@@ -350,14 +350,17 @@ TEST_F(DictionaryPreferenceMergeTest, MergeConflicts) {
 }
 
 TEST_F(DictionaryPreferenceMergeTest, MergeValueToDictionary) {
-  base::DictionaryValue local_dict_value;
-  local_dict_value.SetInteger("key", 0);
+  base::Value::Dict local_dict_value;
+  local_dict_value.Set("key", 0);
 
-  base::DictionaryValue server_dict_value;
-  server_dict_value.SetInteger("key.subkey", 0);
+  base::Value::Dict server_dict_value;
+  server_dict_value.SetByDottedPath("key.subkey", 0);
 
+  // TODO(https://crbug.com/1187026): Migrate MergePreference() to
+  // take a base::Value::Dict.
   base::Value merged_value(pref_sync_service_->MergePreference(
-      kDictionaryPrefName, local_dict_value, server_dict_value));
+      kDictionaryPrefName, base::Value(local_dict_value.Clone()),
+      base::Value(server_dict_value.Clone())));
 
   EXPECT_EQ(merged_value, server_dict_value);
 }