Remove unnecessary `typename'.
diff --git a/src/walltime.cc b/src/walltime.cc
index e045729..65ae610 100644
--- a/src/walltime.cc
+++ b/src/walltime.cc
@@ -51,7 +51,7 @@
 
 struct ChooseClockType {
 #if defined(HAVE_STEADY_CLOCK)
-  typedef typename ChooseSteadyClock<>::type type;
+  typedef ChooseSteadyClock<>::type type;
 #else
   typedef std::chrono::high_resolution_clock type;
 #endif