diff --git a/demo/os/windows/make.bat b/demo/os/windows/make.bat
index 828b5a5..b193d80 100644
--- a/demo/os/windows/make.bat
+++ b/demo/os/windows/make.bat
@@ -1,3 +1,4 @@
+mkdir out
 gcc -I "easylogger\inc" -I "..\..\..\easylogger\inc" -O0 -g3 -Wall -c "..\..\..\easylogger\src\elog.c" -o "out\elog.o" 
 gcc -I "easylogger\inc" -I "..\..\..\easylogger\inc" -I "..\..\..\easylogger\plugins\file" -O0 -g3 -Wall -c "easylogger\port\elog_port.c" -o "out\elog_port.o"
 gcc -I "easylogger\inc" -I "..\..\..\easylogger\inc" -O0 -g3 -Wall -c  "..\..\..\easylogger\src\elog_utils.c" -o "out\elog_utils.o"
diff --git a/easylogger/src/elog.c b/easylogger/src/elog.c
index d566143..3765ee5 100755
--- a/easylogger/src/elog.c
+++ b/easylogger/src/elog.c
@@ -141,7 +141,7 @@ static const char *color_output_info[] = {
 #endif /* ELOG_COLOR_ENABLE */
 
 static bool get_fmt_enabled(uint8_t level, size_t set);
-static void elog_set_filter_tag_lvl_default();
+static void elog_set_filter_tag_lvl_default(void);
 
 /* EasyLogger assert hook */
 void (*elog_assert_hook)(const char* expr, const char* func, size_t line);
@@ -389,7 +389,7 @@ void elog_output_unlock(void) {
 /**
  * set log filter's tag level val to default
  */
-static void elog_set_filter_tag_lvl_default()
+static void elog_set_filter_tag_lvl_default(void)
 {
     uint8_t i = 0;