diff --git a/src/BundleCeres.cpp b/src/BundleCeres.cpp
index 863edcd..b789fc8 100644
--- a/src/BundleCeres.cpp
+++ b/src/BundleCeres.cpp
@@ -7,8 +7,11 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <float.h>
+#if defined(_WIN32) || defined(_WIN64)
+#include "time_unix.h"	
+#else
 #include <sys/time.h>
-
+#endif
 #include "matrix.h"
 #include "qsort.h"
 #include "util.h"
@@ -19,6 +22,7 @@
 
 #include <ceres/ceres.h>
 #include "snavely_reprojection_error.h"
+#include "ceres/rotation.h"
 
 #include <omp.h>
 
diff --git a/src/time_unix.cpp b/src/time_unix.cpp
new file mode 100644
index 0000000..ede75af
--- /dev/null
+++ b/src/time_unix.cpp
@@ -0,0 +1,22 @@
+#include "time_unix.h"
+
+int gettimeofday(struct timeval * tp, struct timezone * tzp)
+{
+	// Note: some broken versions only have 8 trailing zero's, the correct epoch has 9 trailing zero's
+	// This magic number is the number of 100 nanosecond intervals since January 1, 1601 (UTC)
+	// until 00:00:00 January 1, 1970 
+	static const uint64_t EPOCH = ((uint64_t)116444736000000000ULL);
+
+	SYSTEMTIME  system_time;
+	FILETIME    file_time;
+	uint64_t    time;
+
+	GetSystemTime(&system_time);
+	SystemTimeToFileTime(&system_time, &file_time);
+	time = ((uint64_t)file_time.dwLowDateTime);
+	time += ((uint64_t)file_time.dwHighDateTime) << 32;
+
+	tp->tv_sec = (long)((time - EPOCH) / 10000000L);
+	tp->tv_usec = (long)(system_time.wMilliseconds * 1000);
+	return 0;
+}
\ No newline at end of file
diff --git a/src/time_unix.h b/src/time_unix.h
new file mode 100644
index 0000000..d762e0f
--- /dev/null
+++ b/src/time_unix.h
@@ -0,0 +1,17 @@
+#pragma once
+//original
+//https://stackoverflow.com/questions/10905892/equivalent-of-gettimeday-for-windows
+
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+#include <stdint.h> // portable: uint64_t   MSVC: __int64 
+
+#undef ERROR
+
+// MSVC defines this in winsock2.h!?
+typedef struct timeval {
+	long tv_sec;
+	long tv_usec;
+} timeval;
+
+int gettimeofday(struct timeval * tp, struct timezone * tzp);
\ No newline at end of file