diff --git a/include/spdlog/details/log_msg.h b/include/spdlog/details/log_msg.h
index a9fe9201..8d39a010 100644
--- a/include/spdlog/details/log_msg.h
+++ b/include/spdlog/details/log_msg.h
@@ -8,7 +8,6 @@
 #include "../common.h"
 #include "../details/os.h"
 
-
 #include <string>
 #include <utility>
 
@@ -21,8 +20,7 @@ struct log_msg
     log_msg() = default;
     log_msg(const std::string *loggers_name, level::level_enum lvl) :
         logger_name(loggers_name),
-        level(lvl),
-        msg_id(0)
+        level(lvl)
     {
 #ifndef SPDLOG_NO_DATETIME
         time = os::now();
@@ -38,13 +36,13 @@ struct log_msg
     log_msg(log_msg&& other) = delete;
 
 
-    const std::string *logger_name;
+    const std::string *logger_name{ nullptr };
     level::level_enum level;
     log_clock::time_point time;
     size_t thread_id;
     fmt::MemoryWriter raw;
     fmt::MemoryWriter formatted;
-    size_t msg_id;
+    size_t msg_id{ 0 };
 };
 }
 }
diff --git a/include/spdlog/details/os.h b/include/spdlog/details/os.h
index a3597ca6..6cc42d45 100644
--- a/include/spdlog/details/os.h
+++ b/include/spdlog/details/os.h
@@ -81,10 +81,10 @@ inline std::tm localtime(const std::time_t &time_tt)
 {
 
 #ifdef _WIN32
-    std::tm tm;
+    std::tm tm{};
     localtime_s(&tm, &time_tt);
 #else
-    std::tm tm;
+    std::tm tm{};
     localtime_r(&time_tt, &tm);
 #endif
     return tm;
@@ -96,15 +96,14 @@ inline std::tm localtime()
     return localtime(now_t);
 }
 
-
 inline std::tm gmtime(const std::time_t &time_tt)
 {
 
 #ifdef _WIN32
-    std::tm tm;
+    std::tm tm{};
     gmtime_s(&tm, &time_tt);
 #else
-    std::tm tm;
+    std::tm tm{};
     gmtime_r(&time_tt, &tm);
 #endif
     return tm;
@@ -220,7 +219,7 @@ inline bool file_exists(const filename_t& filename)
 #endif
     return (attribs != INVALID_FILE_ATTRIBUTES && !(attribs & FILE_ATTRIBUTE_DIRECTORY));
 #else //common linux/unix all have the stat system call
-    struct stat buffer;
+    struct stat buffer{};
     return (stat(filename.c_str(), &buffer) == 0);
 #endif
 }
@@ -250,11 +249,11 @@ inline size_t filesize(FILE *f)
     int fd = fileno(f);
     //64 bits(but not in osx or cygwin, where fstat64 is deprecated)
 #if !defined(__FreeBSD__) && !defined(__APPLE__) && (defined(__x86_64__) || defined(__ppc64__)) && !defined(__CYGWIN__)
-    struct stat64 st;
+    struct stat64 st{};
     if (fstat64(fd, &st) == 0)
         return static_cast<size_t>(st.st_size);
 #else // unix 32 bits or cygwin
-    struct stat st;
+    struct stat st{};
     if (fstat(fd, &st) == 0)
         return static_cast<size_t>(st.st_size);
 #endif
diff --git a/include/spdlog/details/registry.h b/include/spdlog/details/registry.h
index 28d8d2fa..a7ef0888 100644
--- a/include/spdlog/details/registry.h
+++ b/include/spdlog/details/registry.h
@@ -213,7 +213,7 @@ private:
     size_t _async_q_size = 0;
     async_overflow_policy _overflow_policy = async_overflow_policy::block_retry;
     std::function<void()> _worker_warmup_cb = nullptr;
-    std::chrono::milliseconds _flush_interval_ms;
+    std::chrono::milliseconds _flush_interval_ms{ 0 };
     std::function<void()> _worker_teardown_cb = nullptr;
 };