diff --git a/src/fileops.h b/src/fileops.h
index 175396917..749a91d74 100644
--- a/src/fileops.h
+++ b/src/fileops.h
@@ -23,11 +23,6 @@ static inline int link(const char *old, const char *new)
 	return -1;
 }
 
-static inline int fsync(int fd)
-{
-	return 0;
-}
-
 static inline int git__mkdir(const char *path, int mode)
 {
 	return mkdir(path);
@@ -35,11 +30,13 @@ static inline int git__mkdir(const char *path, int mode)
 
 extern int git__unlink(const char *path);
 extern int git__mkstemp(char *template);
+extern int git__fsync(int fd);
 
 # ifndef GIT__WIN32_NO_HIDE_FILEOPS
 #  define unlink(p) git__unlink(p)
 #  define mkstemp(t) git__mkstemp(t)
 #  define mkdir(p,m) git__mkdir(p,m)
+#  define fsync(fd) git__fsync(fd)
 # endif
 #endif  /* GIT_WIN32 */
 
diff --git a/src/win32/fileops.c b/src/win32/fileops.c
index c6039d8f2..d435e706e 100644
--- a/src/win32/fileops.c
+++ b/src/win32/fileops.c
@@ -1,5 +1,6 @@
 #define GIT__WIN32_NO_HIDE_FILEOPS
 #include "fileops.h"
+#include <errno.h>
 
 int git__unlink(const char *path)
 {
@@ -15,3 +16,26 @@ int git__mkstemp(char *template)
 	return open(file, O_RDWR | O_CREAT | O_BINARY, 0600);
 }
 
+int git__fsync(int fd)
+{
+	HANDLE fh = (HANDLE)_get_osfhandle(fd);
+
+	if (fh == INVALID_HANDLE_VALUE) {
+		errno = EBADF;
+		return -1;
+	}
+
+	if (!FlushFileBuffers(fh)) {
+		DWORD code = GetLastError();
+
+		if (code == ERROR_INVALID_HANDLE)
+			errno = EINVAL;
+		else
+			errno = EIO;
+
+		return -1;
+	}
+
+	return 0;
+}
+