diff --git a/lib/std/libc/libc.c3 b/lib/std/libc/libc.c3
index 0d9c7b038..a8df60614 100644
--- a/lib/std/libc/libc.c3
+++ b/lib/std/libc/libc.c3
@@ -148,6 +148,7 @@ extern fn void qsort(void* base, usz items, usz size, CompareFunction compare);
 extern fn CInt raise(CInt signal);
 extern fn CInt rand();
 extern fn isz read(Fd fd, void* buf, usz nbyte) @if(!env::WIN32);
+extern fn isz readlink(ZString pathname, char* buf, int bufsize) @if(!env::WIN32);
 extern fn void* realloc(void* ptr, usz size);
 extern fn CInt remove(ZString filename);
 extern fn CInt rename(ZString old_name, ZString new_name);