diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 54b39ff56..8c0075880 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -4682,7 +4682,7 @@ struct wide_string_input_helper<BaseInputAdapter, 2>
             }
             else
             {
-                if (!input.empty())
+                if (JSON_HEDLEY_UNLIKELY(not input.empty()))
                 {
                     const auto wc2 = static_cast<unsigned int>(input.get_character());
                     const auto charcode = 0x10000u + (((wc & 0x3FFu) << 10u) | (wc2 & 0x3FFu));
@@ -4821,7 +4821,7 @@ using contiguous_bytes_input_adapter = decltype(input_adapter(std::declval<const
 template < typename CharT,
            typename std::enable_if <
                std::is_pointer<CharT>::value and
-               !std::is_array<CharT>::value and
+               not std::is_array<CharT>::value and
                std::is_integral<typename std::remove_pointer<CharT>::type>::value and
                sizeof(typename std::remove_pointer<CharT>::type) == 1,
                int >::type = 0 >
diff --git a/test/src/unit-user_defined_input.cpp b/test/src/unit-user_defined_input.cpp
index 06be4e136..86f763d5a 100644
--- a/test/src/unit-user_defined_input.cpp
+++ b/test/src/unit-user_defined_input.cpp
@@ -98,7 +98,7 @@ TEST_CASE("Custom iterator")
         {
             return *ptr;
         }
-        
+
         bool operator!=(const MyIterator& rhs) const
         {
             return ptr != rhs.ptr;