diff --git a/util-unix.cpp b/util-unix.cpp
index 1224e66..ec4ecfb 100644
--- a/util-unix.cpp
+++ b/util-unix.cpp
@@ -31,7 +31,9 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <sys/time.h>
 #include <errno.h>
+#include <utime.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <limits.h>
@@ -274,6 +276,13 @@ bool successful_exit (int status)
 	return status != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0;
 }
 
+void	touch_file (const std::string& filename)
+{
+	if (utimes(filename.c_str(), NULL) == -1) {
+		throw System_error("utimes", "", errno);
+	}
+}
+
 static void	init_std_streams_platform ()
 {
 }
diff --git a/util-win32.cpp b/util-win32.cpp
index b0d20d1..6f9d358 100644
--- a/util-win32.cpp
+++ b/util-win32.cpp
@@ -320,6 +320,25 @@ bool successful_exit (int status)
 	return status == 0;
 }
 
+void	touch_file (const std::string& filename)
+{
+	HANDLE	fh = CreateFileA(filename.c_str(), FILE_WRITE_ATTRIBUTES, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);
+	if (fh == INVALID_HANDLE_VALUE) {
+		throw System_error("CreateFileA", filename, GetLastError());
+	}
+	SYSTEMTIME	system_time;
+	GetSystemTime(&system_time);
+	FILETIME	file_time;
+	SystemTimeToFileTime(&system_time, &file_time);
+
+	if (!SetFileTime(fh, NULL, NULL, &file_time)) {
+		DWORD	error = GetLastError();
+		CloseHandle(fh);
+		throw System_error("SetFileTime", filename, error);
+	}
+	CloseHandle(fh);
+}
+
 static void	init_std_streams_platform ()
 {
 	_setmode(_fileno(stdin), _O_BINARY);
diff --git a/util.hpp b/util.hpp
index cf23771..bb79ee2 100644
--- a/util.hpp
+++ b/util.hpp
@@ -64,6 +64,7 @@ int		exec_command (const std::vector<std::string>&);
 int		exec_command (const std::vector<std::string>&, std::ostream& output);
 int		exec_command_with_input (const std::vector<std::string>&, const char* p, size_t len);
 bool		successful_exit (int status);
+void		touch_file (const std::string&);
 std::string	escape_shell_arg (const std::string&);
 uint32_t	load_be32 (const unsigned char*);
 void		store_be32 (unsigned char*, uint32_t);