diff --git a/tests/daemon/global-io-fixture.hpp b/tests/daemon/global-io-fixture.hpp
index 6dbc891..544c466 100644
--- a/tests/daemon/global-io-fixture.hpp
+++ b/tests/daemon/global-io-fixture.hpp
@@ -43,6 +43,11 @@
 
   ~GlobalIoFixture();
 
+  /** \brief Poll the global io_service.
+   */
+  size_t
+  pollIo();
+
 protected:
   /** \brief Reference to the global io_service instance.
    */