diff --git a/tests/unit/util/scheduler.t.cpp b/tests/unit/util/scheduler.t.cpp
index d8335c4..77b60a5 100644
--- a/tests/unit/util/scheduler.t.cpp
+++ b/tests/unit/util/scheduler.t.cpp
@@ -31,9 +31,7 @@
 namespace scheduler {
 namespace tests {
 
-using namespace ndn::tests;
-
-class SchedulerFixture : public UnitTestTimeFixture
+class SchedulerFixture : public ndn::tests::UnitTestTimeFixture
 {
 public:
   SchedulerFixture()