diff --git a/mlibc/include/stdlib.h b/mlibc/include/stdlib.h
index caeb192a..43ed3215 100644
--- a/mlibc/include/stdlib.h
+++ b/mlibc/include/stdlib.h
@@ -39,6 +39,7 @@ char* getenv (char const* s);
 void *malloc (size_t);
 void qsort (void *base, size_t nmemb, size_t size, int (*compar)(void const *, void const *));
 void *realloc (void *p, size_t size);
+long strtol (char const *nptr, char **endptr, int base);
 unsigned long strtoul (char const *nptr, char **endptr, int base);
 
 #endif // !(__GNUC__ && POSIX)
diff --git a/mlibc/libc-mes+tcc.c b/mlibc/libc-mes+tcc.c
index 5857d7de..0bc5c704 100644
--- a/mlibc/libc-mes+tcc.c
+++ b/mlibc/libc-mes+tcc.c
@@ -136,6 +136,12 @@ strchr (char const *s, int c)
   return 0;
 }
 
+long
+strtol (char const *nptr, char **endptr, int base)
+{
+  return 0;
+}
+
 unsigned long
 strtoul (char const *nptr, char **endptr, int base)
 {