diff --git a/lib/base/io-engine.hpp b/lib/base/io-engine.hpp
index d08525081..ebb498818 100644
--- a/lib/base/io-engine.hpp
+++ b/lib/base/io-engine.hpp
@@ -30,6 +30,9 @@
 #include <boost/asio/io_service.hpp>
 #include <boost/asio/spawn.hpp>
 
+namespace icinga
+{
+
 /**
  * Scope lock for CPU-bound work done in an I/O thread
  *
@@ -127,4 +130,6 @@ private:
 	boost::asio::deadline_timer m_Timer;
 };
 
+}
+
 #endif /* IO_ENGINE_H */