diff --git a/include/boost/math/constants/constants.hpp b/include/boost/math/constants/constants.hpp
index d162af7475..3daf2d266e 100644
--- a/include/boost/math/constants/constants.hpp
+++ b/include/boost/math/constants/constants.hpp
@@ -151,7 +151,7 @@ namespace boost{ namespace math
          {
             initializer()
             {
-               F();
+               (F)();
             }
             void force_instantiate()const{}
          };