diff --git a/lib/heap.c b/lib/heap.c
index e6df048..3d904c8 100644
--- a/lib/heap.c
+++ b/lib/heap.c
@@ -82,4 +82,8 @@ static TYC_RESULT heap_get_string(Heap* h, HEAP_KEY key, const char** value)
 static size_t heap_size(Heap* h)
 {
     return kh_size(h->items);
+}
+
+static void heap_gc(Heap* h, VALUE const* roots, size_t n_roots)
+{
 }
\ No newline at end of file