diff --git a/libs/server/test/TestPeriodicScheduler.cpp b/libs/server/test/TestPeriodicScheduler.cpp
index ba98a862a..e9cb492e6 100644
--- a/libs/server/test/TestPeriodicScheduler.cpp
+++ b/libs/server/test/TestPeriodicScheduler.cpp
@@ -87,7 +87,7 @@ BOOST_AUTO_TEST_CASE(test_periodic_scheduler_over_one_minute) {
     // Run services
     io_service.run();
 
-    BOOST_CHECK_EQUAL(collector.instants.size(), 62L);
+    BOOST_CHECK_EQUAL(collector.instants.size(), static_cast<size_t>(62));
 }
 
 BOOST_AUTO_TEST_CASE(test_periodic_scheduler_with_long_lasting_activity) {