diff --git a/server/RouteControllerTest.cpp b/server/RouteControllerTest.cpp
index b6e648a..20b3618 100644
--- a/server/RouteControllerTest.cpp
+++ b/server/RouteControllerTest.cpp
@@ -79,18 +79,18 @@
     static_assert(table2 < RouteController::ROUTE_TABLE_OFFSET_FROM_INDEX,
                   "Test table2 number too large");
 
-    EXPECT_EQ(0, modifyIpRoute(RTM_NEWROUTE, table1, "lo", "192.0.2.2/32", NULL));
-    EXPECT_EQ(0, modifyIpRoute(RTM_NEWROUTE, table1, "lo", "192.0.2.3/32", NULL));
-    EXPECT_EQ(0, modifyIpRoute(RTM_NEWROUTE, table2, "lo", "192.0.2.4/32", NULL));
+    EXPECT_EQ(0, modifyIpRoute(RTM_NEWROUTE, table1, "lo", "192.0.2.2/32", nullptr));
+    EXPECT_EQ(0, modifyIpRoute(RTM_NEWROUTE, table1, "lo", "192.0.2.3/32", nullptr));
+    EXPECT_EQ(0, modifyIpRoute(RTM_NEWROUTE, table2, "lo", "192.0.2.4/32", nullptr));
 
     EXPECT_EQ(0, flushRoutes(table1));
 
     EXPECT_EQ(-ESRCH,
-              modifyIpRoute(RTM_DELROUTE, table1, "lo", "192.0.2.2/32", NULL));
+              modifyIpRoute(RTM_DELROUTE, table1, "lo", "192.0.2.2/32", nullptr));
     EXPECT_EQ(-ESRCH,
-              modifyIpRoute(RTM_DELROUTE, table1, "lo", "192.0.2.3/32", NULL));
+              modifyIpRoute(RTM_DELROUTE, table1, "lo", "192.0.2.3/32", nullptr));
     EXPECT_EQ(0,
-              modifyIpRoute(RTM_DELROUTE, table2, "lo", "192.0.2.4/32", NULL));
+              modifyIpRoute(RTM_DELROUTE, table2, "lo", "192.0.2.4/32", nullptr));
 }
 
 TEST_F(RouteControllerTest, TestModifyIncomingPacketMark) {