diff --git a/websocketpp/logger/basic.hpp b/websocketpp/logger/basic.hpp
index 975d45deb5..e74bad0718 100644
--- a/websocketpp/logger/basic.hpp
+++ b/websocketpp/logger/basic.hpp
@@ -44,6 +44,7 @@
 #include <iostream>
 #include <iomanip>
 
+#include <websocketpp/common/cpp11.hpp>
 #include <websocketpp/common/stdint.hpp>
 #include <websocketpp/logger/levels.hpp>
 
@@ -101,7 +102,7 @@ public:
         m_out->flush();
     }
 
-    bool static_test(level channel) const {
+    _WEBSOCKETPP_CONSTEXPR_TOKEN_ bool static_test(level channel) const {
         return ((channel & m_static_channels) != 0);
     }
 
diff --git a/websocketpp/logger/stub.hpp b/websocketpp/logger/stub.hpp
index f967612a8c..3f78e96cc6 100644
--- a/websocketpp/logger/stub.hpp
+++ b/websocketpp/logger/stub.hpp
@@ -30,6 +30,7 @@
 
 #include <iostream>
 
+#include <websocketpp/common/cpp11.hpp>
 #include <websocketpp/logger/levels.hpp>
 
 namespace websocketpp {
@@ -40,6 +41,9 @@ class stub {
 public:
     stub(std::ostream* out = &std::cout) {}
     stub(level c, std::ostream* out = &std::cout) {}
+    explicit stub(std::ostream * out) {}
+    stub(level c, std::ostream * out) {}
+    _WEBSOCKETPP_CONSTEXPR_TOKEN_ stub() {}
 
     void set_channels(level channels) {}
     void clear_channels(level channels) {}
@@ -47,8 +51,10 @@ public:
     void write(level channel, const std::string& msg) {}
     void write(level channel, const char* msg) {}
 
-    bool static_test(level channel) const {return false;}
     bool dynamic_test(level channel) {return false;}
+    _WEBSOCKETPP_CONSTEXPR_TOKEN_ bool static_test(level channel) const {
+        return false;
+    }
 };
 
 } // log