diff --git a/include/spdlog/sinks/base_sink-inl.h b/include/spdlog/sinks/base_sink-inl.h
index 421fdf9d..9cf961e1 100644
--- a/include/spdlog/sinks/base_sink-inl.h
+++ b/include/spdlog/sinks/base_sink-inl.h
@@ -4,60 +4,53 @@
 #pragma once
 
 #ifndef SPDLOG_HEADER_ONLY
-#    include <spdlog/sinks/base_sink.h>
+    #include <spdlog/sinks/base_sink.h>
 #endif
 
 #include <spdlog/common.h>
 #include <spdlog/pattern_formatter.h>
 
 #include <memory>
+#include <mutex>
 
-template<typename Mutex>
+template <typename Mutex>
 SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::base_sink()
-    : formatter_{details::make_unique<spdlog::pattern_formatter>()}
-{}
+    : formatter_{details::make_unique<spdlog::pattern_formatter>()} {}
 
-template<typename Mutex>
+template <typename Mutex>
 SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::base_sink(std::unique_ptr<spdlog::formatter> formatter)
-    : formatter_{std::move(formatter)}
-{}
+    : formatter_{std::move(formatter)} {}
 
-template<typename Mutex>
-void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::log(const details::log_msg &msg)
-{
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::log(const details::log_msg &msg) {
     std::lock_guard<Mutex> lock(mutex_);
     sink_it_(msg);
 }
 
-template<typename Mutex>
-void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::flush()
-{
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::flush() {
     std::lock_guard<Mutex> lock(mutex_);
     flush_();
 }
 
-template<typename Mutex>
-void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_pattern(const std::string &pattern)
-{
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_pattern(const std::string &pattern) {
     std::lock_guard<Mutex> lock(mutex_);
     set_pattern_(pattern);
 }
 
-template<typename Mutex>
-void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter)
-{
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_formatter(std::unique_ptr<spdlog::formatter> sink_formatter) {
     std::lock_guard<Mutex> lock(mutex_);
     set_formatter_(std::move(sink_formatter));
 }
 
-template<typename Mutex>
-void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_pattern_(const std::string &pattern)
-{
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_pattern_(const std::string &pattern) {
     set_formatter_(details::make_unique<spdlog::pattern_formatter>(pattern));
 }
 
-template<typename Mutex>
-void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_formatter_(std::unique_ptr<spdlog::formatter> sink_formatter)
-{
+template <typename Mutex>
+void SPDLOG_INLINE spdlog::sinks::base_sink<Mutex>::set_formatter_(std::unique_ptr<spdlog::formatter> sink_formatter) {
     formatter_ = std::move(sink_formatter);
 }