diff --git a/source/lib/sysdep/filesystem.h b/source/lib/sysdep/filesystem.h
index e2c21d35b1..1988274daa 100644
--- a/source/lib/sysdep/filesystem.h
+++ b/source/lib/sysdep/filesystem.h
@@ -55,11 +55,4 @@ extern int wopen(const OsPath& pathname, int oflag);
 extern int wopen(const OsPath& pathname, int oflag, mode_t mode);
 extern int wclose(int fd);
 
-
-//
-// sys/stat.h
-//
-
-int wmkdir(const OsPath& path, mode_t mode);
-
 #endif	// #ifndef INCLUDED_SYSDEP_FILESYSTEM
diff --git a/source/lib/sysdep/os/unix/ufilesystem.cpp b/source/lib/sysdep/os/unix/ufilesystem.cpp
index 60631ad354..612e6fb215 100644
--- a/source/lib/sysdep/os/unix/ufilesystem.cpp
+++ b/source/lib/sysdep/os/unix/ufilesystem.cpp
@@ -97,8 +97,3 @@ int wrename(const OsPath& pathnameOld, const OsPath& pathnameNew)
 {
 	return rename(OsString(pathnameOld).c_str(), OsString(pathnameNew).c_str());
 }
-
-int wmkdir(const OsPath& path, mode_t mode)
-{
-	return mkdir(OsString(path).c_str(), mode);
-}
diff --git a/source/lib/sysdep/os/win/wposix/wfilesystem.cpp b/source/lib/sysdep/os/win/wposix/wfilesystem.cpp
index 66a48b6704..0561721fda 100644
--- a/source/lib/sysdep/os/win/wposix/wfilesystem.cpp
+++ b/source/lib/sysdep/os/win/wposix/wfilesystem.cpp
@@ -129,34 +129,3 @@ int wclose(int fd)
 		return _close(fd);
 	return 0;
 }
-
-
-static int ErrnoFromCreateDirectory()
-{
-	switch(GetLastError())
-	{
-	case ERROR_ALREADY_EXISTS:
-		return EEXIST;
-	case ERROR_PATH_NOT_FOUND:
-		return ENOENT;
-	case ERROR_ACCESS_DENIED:
-		return EACCES;
-	case ERROR_WRITE_PROTECT:
-		return EROFS;
-	case ERROR_DIRECTORY:
-		return ENOTDIR;
-	default:
-		return 0;
-	}
-}
-
-int wmkdir(const OsPath& path, mode_t)
-{
-	if(!CreateDirectoryW(OsString(path).c_str(), (LPSECURITY_ATTRIBUTES)NULL))
-	{
-		errno = ErrnoFromCreateDirectory();
-		return -1;
-	}
-
-	return 0;
-}