Fixed a compilation issue on GCC 5.5 and older.
diff --git a/src/tests/master_tests.cpp b/src/tests/master_tests.cpp
index 41b4a49..cd0973e 100644
--- a/src/tests/master_tests.cpp
+++ b/src/tests/master_tests.cpp
@@ -7776,7 +7776,7 @@
     const v1::master::Response::GetAgents::Agent& agent =
       response->get_agents().agents(0);
 
-    EXPECT_EQ(false, agent.active());
+    EXPECT_FALSE(agent.active());
   }
 
   EXPECT_CALL(exec, shutdown(_));