diff --git a/tap.cpp b/tap.cpp
index b138f3a9..905eea1a 100644
--- a/tap.cpp
+++ b/tap.cpp
@@ -22,7 +22,8 @@
 
 using util::TAP::logger;
 
-//-----------------------------------------------------------------------------
+
+///////////////////////////////////////////////////////////////////////////////
 logger::logger ():
     m_status (EXIT_SUCCESS),
     m_size (0)
@@ -36,17 +37,6 @@ logger::~logger ()
 }
 
 
-////////////0//////////////////////////////////////////////////////////////////
-void
-util::TAP::logger::expect (bool test, const std::string &msg)
-{
-    std::cout << (test ? "ok " : "not ok ") << ++m_size << " - " << msg << '\n';
-
-    if (!test)
-        m_status = EXIT_FAILURE;
-}
-
-
 ///////////////////////////////////////////////////////////////////////////////
 void
 logger::skip (const std::string &msg)
@@ -71,7 +61,7 @@ logger::noop (void)
 }
 
 
-//-----------------------------------------------------------------------------
+///////////////////////////////////////////////////////////////////////////////
 int
 logger::status (void) const
 {
diff --git a/tap.hpp b/tap.hpp
index 7cb3fe94..4ef921f0 100644
--- a/tap.hpp
+++ b/tap.hpp
@@ -37,7 +37,8 @@ namespace util { namespace TAP {
         ~logger ();
 
         //---------------------------------------------------------------------
-        void expect (bool, const std::string &msg);
+        template <typename ...Args>
+        void expect (bool, const std::string &fmt, Args&&...);
 
         template <typename ...Args>
         void expect (std::function<bool(Args...)>, Args&&..., const std::string& msg);
diff --git a/tap.ipp b/tap.ipp
index 5ca1a675..7cce5cbd 100644
--- a/tap.ipp
+++ b/tap.ipp
@@ -27,6 +27,20 @@
 #include "format.hpp"
 
 
+///////////////////////////////////////////////////////////////////////////////
+template <typename ...Args>
+void
+util::TAP::logger::expect (bool test, const std::string &fmt, Args&&... args)
+{
+    std::cout << (test ? "ok " : "not ok ") << ++m_size
+              << " - "
+              << util::format::render (fmt, std::forward<Args> (args)...) << '\n';
+
+    if (!test)
+        m_status = EXIT_FAILURE;
+}
+
+
 //-----------------------------------------------------------------------------
 template <typename... Args>
 void