diff --git a/mlibc/include/stdlib.h b/mlibc/include/stdlib.h
index cc5f32ea..0525bb2c 100644
--- a/mlibc/include/stdlib.h
+++ b/mlibc/include/stdlib.h
@@ -40,6 +40,7 @@ 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);
+long long strtoll (char const *nptr, char **endptr, int base);
 unsigned long strtoul (char const *nptr, char **endptr, int base);
 unsigned long long strtoull (char const *nptr, char **endptr, int base);
 
diff --git a/mlibc/libc-mes+tcc.c b/mlibc/libc-mes+tcc.c
index 797ff1fb..da56ff35 100644
--- a/mlibc/libc-mes+tcc.c
+++ b/mlibc/libc-mes+tcc.c
@@ -142,6 +142,12 @@ strtol (char const *nptr, char **endptr, int base)
   return 0;
 }
 
+long long int
+strtoll (char const *nptr, char **endptr, int base)
+{
+  return 0;
+}
+
 unsigned long
 strtoul (char const *nptr, char **endptr, int base)
 {