diff --git a/stepmania/src/archutils/Win32/arch_setup.cpp b/stepmania/src/archutils/Win32/arch_setup.cpp
new file mode 100644
index 0000000000..ac526c0ab7
--- /dev/null
+++ b/stepmania/src/archutils/Win32/arch_setup.cpp
@@ -0,0 +1,22 @@
+#include "global.h"
+#include "arch_setup.h"
+#include "RageThreads.h"
+#include <time.h>
+
+struct tm *my_localtime_r( const time_t *timep, struct tm *result )
+{
+	static RageMutex mut;
+	LockMut(mut);
+
+	*result = *localtime( timep );
+	return result;
+}
+
+struct tm *my_gmtime_r( const time_t *timep, struct tm *result )
+{
+	static RageMutex mut;
+	LockMut(mut);
+
+	*result = *gmtime( timep );
+	return result;
+}
diff --git a/stepmania/src/archutils/Win32/arch_setup.h b/stepmania/src/archutils/Win32/arch_setup.h
index e6b894c87a..18d577d024 100644
--- a/stepmania/src/archutils/Win32/arch_setup.h
+++ b/stepmania/src/archutils/Win32/arch_setup.h
@@ -22,6 +22,13 @@
 /* mkdir is missing the mode arg */
 #define mkdir(p,m) mkdir(p)
 
+typedef time_t time_t;
+struct tm;
+struct tm *my_localtime_r( const time_t *timep, struct tm *result );
+#define localtime_r my_localtime_r
+struct tm *my_gmtime_r( const time_t *timep, struct tm *result );
+#define gmtime_r my_gmtime_r
+
 /* Missing stdint types: */
 typedef __int64 int64_t;
 typedef unsigned __int64 uint64_t;