diff --git a/include/spdlog/details/file_helper.h b/include/spdlog/details/file_helper.h
index 8ae67bf0..8e1f600b 100644
--- a/include/spdlog/details/file_helper.h
+++ b/include/spdlog/details/file_helper.h
@@ -87,6 +87,10 @@ public:
 
     }
 
+    void flush() {
+        std::fflush(_fd);
+    }
+
     void close()
     {
         if (_fd)
diff --git a/include/spdlog/sinks/base_sink.h b/include/spdlog/sinks/base_sink.h
index f1647ae0..55411721 100644
--- a/include/spdlog/sinks/base_sink.h
+++ b/include/spdlog/sinks/base_sink.h
@@ -58,6 +58,7 @@ public:
         _sink_it(msg);
     }
 
+    virtual void flush() = 0;
 
 protected:
     virtual void _sink_it(const details::log_msg& msg) = 0;
diff --git a/include/spdlog/sinks/file_sinks.h b/include/spdlog/sinks/file_sinks.h
index 9ec8f46b..0e705337 100644
--- a/include/spdlog/sinks/file_sinks.h
+++ b/include/spdlog/sinks/file_sinks.h
@@ -80,6 +80,10 @@ public:
         _file_helper.open(calc_filename(_base_filename, 0, _extension));
     }
 
+    virtual void flush() override {
+        _file_helper.flush();
+    }
+
 protected:
     void _sink_it(const details::log_msg& msg) override
     {
@@ -167,6 +171,10 @@ public:
         _file_helper.open(calc_filename(_base_filename, _extension));
     }
 
+    virtual void flush() override {
+        _file_helper.flush();
+    }
+
 protected:
     void _sink_it(const details::log_msg& msg) override
     {
diff --git a/include/spdlog/sinks/null_sink.h b/include/spdlog/sinks/null_sink.h
index 2cd416a9..992b3b73 100644
--- a/include/spdlog/sinks/null_sink.h
+++ b/include/spdlog/sinks/null_sink.h
@@ -40,6 +40,9 @@ protected:
     void _sink_it(const details::log_msg&) override
     {}
 
+    void flush() override
+    {}
+
 };
 typedef null_sink<details::null_mutex> null_sink_st;
 typedef null_sink<std::mutex> null_sink_mt;
diff --git a/include/spdlog/sinks/ostream_sink.h b/include/spdlog/sinks/ostream_sink.h
index 91580301..7b6b9db3 100644
--- a/include/spdlog/sinks/ostream_sink.h
+++ b/include/spdlog/sinks/ostream_sink.h
@@ -51,6 +51,11 @@ protected:
         if (_force_flush)
             _ostream.flush();
     }
+
+    virtual void flush() override {
+        _ostream.flush();
+    }
+
     std::ostream& _ostream;
     bool _force_flush;
 };