diff --git a/include/mimic++/adapters/BoostTest.hpp b/include/mimic++/adapters/BoostTest.hpp
index d47458980..82fddd3c4 100644
--- a/include/mimic++/adapters/BoostTest.hpp
+++ b/include/mimic++/adapters/BoostTest.hpp
@@ -29,23 +29,20 @@ namespace mimicpp::reporting::detail::boost_test
     };
 
     [[noreturn]]
-    inline void send_fail(const StringViewT msg)
+    inline void send_fail(StringViewT const msg)
     {
         BOOST_TEST_FAIL(msg);
         unreachable();
     }
 
-    inline void send_success(const StringViewT msg)
+    inline void send_success(StringViewT const msg)
     {
         BOOST_TEST_MESSAGE(msg);
     }
 
-    inline void send_warning(const StringViewT msg)
+    inline void send_warning(StringViewT const msg)
     {
-        BOOST_TEST_MESSAGE(
-            format::format(
-                "warning: {}",
-                msg));
+        BOOST_TEST_MESSAGE("warning: ") << msg.data();
     }
 }
 
@@ -72,7 +69,7 @@ namespace mimicpp::reporting
 namespace mimicpp::reporting::detail::boost_test
 {
     [[maybe_unused]]
-    inline const ReporterInstaller<BoostTestReporterT> installer{};
+    inline ReporterInstaller<BoostTestReporterT> const installer{};
 }
 
 #endif
diff --git a/include/mimic++/adapters/Catch2.hpp b/include/mimic++/adapters/Catch2.hpp
index 9600e67e8..4783b2a3b 100644
--- a/include/mimic++/adapters/Catch2.hpp
+++ b/include/mimic++/adapters/Catch2.hpp
@@ -25,7 +25,7 @@
 namespace mimicpp::reporting::detail::catch2
 {
     [[noreturn]]
-    inline void send_fail(const StringViewT msg)
+    inline void send_fail(StringViewT const msg)
     {
 #ifdef CATCH_CONFIG_PREFIX_ALL
         CATCH_FAIL(msg);
@@ -36,7 +36,7 @@ namespace mimicpp::reporting::detail::catch2
         unreachable();
     }
 
-    inline void send_success(const StringViewT msg)
+    inline void send_success(StringViewT const msg)
     {
 #ifdef CATCH_CONFIG_PREFIX_ALL
         CATCH_SUCCEED(msg);
@@ -45,7 +45,7 @@ namespace mimicpp::reporting::detail::catch2
 #endif
     }
 
-    inline void send_warning(const StringViewT msg)
+    inline void send_warning(StringViewT const msg)
     {
 #ifdef CATCH_CONFIG_PREFIX_MESSAGES
         CATCH_WARN(msg);
diff --git a/include/mimic++/adapters/Doctest.hpp b/include/mimic++/adapters/Doctest.hpp
index af3b23920..02e06e9a2 100644
--- a/include/mimic++/adapters/Doctest.hpp
+++ b/include/mimic++/adapters/Doctest.hpp
@@ -27,18 +27,18 @@ namespace mimicpp::reporting::detail::doctest
     using namespace ::doctest;
 
     [[noreturn]]
-    inline void send_fail(const StringViewT msg)
+    inline void send_fail(StringViewT const msg)
     {
         DOCTEST_FAIL(msg);
         unreachable();
     }
 
-    inline void send_success(const StringViewT msg)
+    inline void send_success(StringViewT const msg)
     {
         DOCTEST_REQUIRE_MESSAGE(true, msg);
     }
 
-    inline void send_warning(const StringViewT msg)
+    inline void send_warning(StringViewT const msg)
     {
         DOCTEST_MESSAGE(msg);
     }
@@ -67,7 +67,7 @@ namespace mimicpp::reporting
 namespace mimicpp::reporting::detail::doctest
 {
     [[maybe_unused]]
-    inline const ReporterInstaller<DoctestReporterT> installer{};
+    inline ReporterInstaller<DoctestReporterT> const installer{};
 }
 
 #endif
diff --git a/include/mimic++/adapters/gtest.hpp b/include/mimic++/adapters/gtest.hpp
index 5a22d92d1..43871ff88 100644
--- a/include/mimic++/adapters/gtest.hpp
+++ b/include/mimic++/adapters/gtest.hpp
@@ -28,7 +28,7 @@ namespace mimicpp::reporting::detail::gtest
     };
 
     [[noreturn]]
-    inline void send_fail(const StringViewT& msg)
+    inline void send_fail(StringViewT const msg)
     {
         // GTEST_FAIL has an immediate return
         std::invoke(
@@ -39,12 +39,12 @@ namespace mimicpp::reporting::detail::gtest
         throw failure{};
     }
 
-    inline void send_success(const StringViewT& msg)
+    inline void send_success(StringViewT const msg)
     {
         GTEST_SUCCEED() << msg;
     }
 
-    inline void send_warning([[maybe_unused]] const StringViewT& msg)
+    inline void send_warning([[maybe_unused]] StringViewT const msg)
     {
         // seems unsupported
     }
@@ -73,7 +73,7 @@ namespace mimicpp::reporting
 namespace mimicpp::reporting::detail::gtest
 {
     [[maybe_unused]]
-    inline const ReporterInstaller<GTestReporterT> installer{};
+    inline ReporterInstaller<GTestReporterT> const installer{};
 }
 
 #endif