diff --git a/CMakeLists.txt b/CMakeLists.txt
index c99be0eb..19472de6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -332,7 +332,7 @@ if (BUILD_TESTING AND NOT_SUBPROJECT)
 
     # Add desired warnings
     if ( CMAKE_CXX_COMPILER_ID MATCHES "Clang|AppleClang|GNU" )
-        target_compile_options( SelfTest PRIVATE -Wall -Wextra -Wunreachable-code )
+        target_compile_options( SelfTest PRIVATE -Wall -Wextra -Wunreachable-code -Wpedantic)
         if (CATCH_ENABLE_WERROR)
             target_compile_options( SelfTest PRIVATE -Werror)
         endif()
diff --git a/include/internal/catch_stringref.cpp b/include/internal/catch_stringref.cpp
index bac8b1d8..b0b2f8e1 100644
--- a/include/internal/catch_stringref.cpp
+++ b/include/internal/catch_stringref.cpp
@@ -15,6 +15,13 @@
 
 #include <ostream>
 #include <cstring>
+#include <cstdint>
+
+namespace {
+    const uint32_t byte_2_lead = 0xC0;
+    const uint32_t byte_3_lead = 0xE0;
+    const uint32_t byte_4_lead = 0xF0;
+}
 
 namespace Catch {
     StringRef::StringRef( char const* rawChars ) noexcept
@@ -79,13 +86,12 @@ namespace Catch {
         // Make adjustments for uft encodings
         for( size_type i=0; i < m_size; ++i ) {
             char c = m_start[i];
-            if( ( c & 0b11000000 ) == 0b11000000 ) {
-                if( ( c & 0b11100000 ) == 0b11000000 )
+            if( ( c & byte_2_lead ) == byte_2_lead ) {
+                noChars--;
+                if (( c & byte_3_lead ) == byte_3_lead )
+                    noChars--;
+                if( ( c & byte_4_lead ) == byte_4_lead )
                     noChars--;
-                else if( ( c & 0b11110000 ) == 0b11100000 )
-                    noChars-=2;
-                else if( ( c & 0b11111000 ) == 0b11110000 )
-                    noChars-=3;
             }
         }
         return noChars;