--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -120,6 +120,9 @@
 #if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
  || defined(_BSD_SOURCE)
 char *realpath (const char *__restrict, char *__restrict);
+#ifdef _GNU_SOURCE
+char *canonicalize_file_name (const char *__restrict);
+#endif
 long int random (void);
 void srandom (unsigned int);
 char *initstate (unsigned int, char *, size_t);
--- a/src/misc/realpath.c
+++ b/src/misc/realpath.c
@@ -42,4 +42,9 @@
 err:
 	__syscall(SYS_close, fd);
 	return 0;
 }
+
+char *canonicalize_file_name(const char *restrict filename)
+{
+	return realpath(filename, NULL);
+}