diff --git a/include/spdlog/details/file_helper.h b/include/spdlog/details/file_helper.h
index 754f6885..7deff3ae 100644
--- a/include/spdlog/details/file_helper.h
+++ b/include/spdlog/details/file_helper.h
@@ -31,9 +31,7 @@ public:
     const int open_tries = 5;
     const int open_interval = 10;
 
-    explicit file_helper() :
-        _fd(nullptr)
-    {}
+    explicit file_helper() {}
 
     file_helper(const file_helper&) = delete;
     file_helper& operator=(const file_helper&) = delete;
@@ -138,7 +136,7 @@ public:
         return std::make_tuple(fname.substr(0, ext_index), fname.substr(ext_index));
     }
 private:
-    FILE* _fd;
+    FILE* _fd{ nullptr };
     filename_t _filename;
 };
 }
diff --git a/include/spdlog/details/pattern_formatter_impl.h b/include/spdlog/details/pattern_formatter_impl.h
index 86c89370..5dc257d1 100644
--- a/include/spdlog/details/pattern_formatter_impl.h
+++ b/include/spdlog/details/pattern_formatter_impl.h
@@ -310,13 +310,12 @@ class T_formatter SPDLOG_FINAL:public flag_formatter
 };
 
 // ISO 8601 offset from UTC in timezone (+-HH:MM)
-class z_formatter SPDLOG_FINAL:public flag_formatter
+class z_formatter SPDLOG_FINAL : public flag_formatter
 {
 public:
     const std::chrono::seconds cache_refresh = std::chrono::seconds(5);
 
-    z_formatter():_last_update(std::chrono::seconds(0)), _offset_minutes(0)
-    {}
+    z_formatter() {}
     z_formatter(const z_formatter&) = delete;
     z_formatter& operator=(const z_formatter&) = delete;
 
@@ -347,8 +346,8 @@ public:
         pad_n_join(msg.formatted, h, m, ':');
     }
 private:
-    log_clock::time_point _last_update;
-    int _offset_minutes;
+    log_clock::time_point _last_update{ std::chrono::seconds(0) };
+    int _offset_minutes{ 0 };
     std::mutex _mutex;
 
     int get_cached_offset(const log_msg& msg, const std::tm& tm_time)
diff --git a/include/spdlog/sinks/sink.h b/include/spdlog/sinks/sink.h
index 8fb045c6..770a2d30 100644
--- a/include/spdlog/sinks/sink.h
+++ b/include/spdlog/sinks/sink.h
@@ -14,11 +14,6 @@ namespace sinks
 class sink
 {
 public:
-    sink()
-    {
-        _level = level::trace;
-    }
-
     virtual ~sink() = default;
     virtual void log(const details::log_msg& msg) = 0;
     virtual void flush() = 0;
@@ -28,7 +23,7 @@ public:
     level::level_enum level() const;
 
 private:
-    level_t _level;
+    level_t _level{ level::trace };
 };
 
 inline bool sink::should_log(level::level_enum msg_level) const