diff --git a/include/cyclone/runtime-main.h b/include/cyclone/runtime-main.h
index 012ece81..c26a0f81 100644
--- a/include/cyclone/runtime-main.h
+++ b/include/cyclone/runtime-main.h
@@ -57,7 +57,7 @@ static void Cyc_main (stack_size,heap_size,stack_base)
   printf("main: Allocating and initializing heap...\n");
 #endif
 
-  Cyc_heap = gc_heap_create(heap_size, 0);
+  Cyc_heap = gc_heap_create(heap_size, 0, 0);
   Cyc_thread = (gc_thread_data *)malloc(sizeof(gc_thread_data));
   Cyc_thread->moveBufLen = 0;
   gc_thr_grow_move_buffer(Cyc_thread); // Initialize the buffer
diff --git a/runtime.c b/runtime.c
index e3cb758a..a60e70a8 100644
--- a/runtime.c
+++ b/runtime.c
@@ -76,6 +76,8 @@ void Cyc_check_bounds(const char *label, int len, int index) {
 /*END closcall section */
 
 /* Global variables. */
+gc_heap *Cyc_heap;
+gc_thread_data *Cyc_thread;
 clock_t start;   /* Starting time. */
 char *stack_begin;   /* Initialized by main. */
 char *stack_limit1;  /* Initialized by main. */