diff --git a/source/lib/sysdep/filesystem.h b/source/lib/sysdep/filesystem.h
index 4b5fba9e2b..fdca713f0d 100644
--- a/source/lib/sysdep/filesystem.h
+++ b/source/lib/sysdep/filesystem.h
@@ -67,8 +67,6 @@ extern int wclose(int fd);
 // this function called.
 int wtruncate(const OsPath& pathname, off_t length);
 
-int wrmdir(const OsPath& path);
-
 
 //
 // stdlib.h
diff --git a/source/lib/sysdep/os/unix/ufilesystem.cpp b/source/lib/sysdep/os/unix/ufilesystem.cpp
index 71da63d66c..4095735e41 100644
--- a/source/lib/sysdep/os/unix/ufilesystem.cpp
+++ b/source/lib/sysdep/os/unix/ufilesystem.cpp
@@ -98,11 +98,6 @@ int wtruncate(const OsPath& pathname, off_t length)
 	return truncate(OsString(pathname).c_str(), length);
 }
 
-int wrmdir(const OsPath& path)
-{
-	return rmdir(OsString(path).c_str());
-}
-
 int wrename(const OsPath& pathnameOld, const OsPath& pathnameNew)
 {
 	return rename(OsString(pathnameOld).c_str(), OsString(pathnameNew).c_str());
diff --git a/source/lib/sysdep/os/win/wposix/wfilesystem.cpp b/source/lib/sysdep/os/win/wposix/wfilesystem.cpp
index d9bbd6fcdd..8aff89ad46 100644
--- a/source/lib/sysdep/os/win/wposix/wfilesystem.cpp
+++ b/source/lib/sysdep/os/win/wposix/wfilesystem.cpp
@@ -146,12 +146,6 @@ int wtruncate(const OsPath& pathname, off_t length)
 }
 
 
-int wrmdir(const OsPath& path)
-{
-	return _wrmdir(OsString(path).c_str());
-}
-
-
 OsPath wrealpath(const OsPath& pathname)
 {
 	wchar_t resolved[PATH_MAX];