diff --git a/mlibc/include/time.h b/mlibc/include/time.h
index a80ea12c..6c2fc12a 100644
--- a/mlibc/include/time.h
+++ b/mlibc/include/time.h
@@ -38,6 +38,7 @@ struct tm {
   int tm_isdst;  /* Daylight saving time */
 };
 
+struct tm *localtime (time_t const *timep);
 time_t time (time_t *tloc);
 
 #endif // ! (__GNUC__ && POSIX)
diff --git a/mlibc/libc-mes+tcc.c b/mlibc/libc-mes+tcc.c
index 342d1f78..807b0092 100644
--- a/mlibc/libc-mes+tcc.c
+++ b/mlibc/libc-mes+tcc.c
@@ -31,6 +31,12 @@ close ()
   asm ("int____$0x80");
 }
 
+struct tm *
+localtime (time_t const *timep)
+{
+  return 0;
+}
+
 void *
 memcpy (void *dest, void const *src, size_t n)
 {