diff --git a/src/gc.c b/src/gc.c
index 4099f42b..bab5505f 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -183,9 +183,8 @@ gc_alloc(pic_state *pic, size_t size)
 
 #if GC_DEBUG
   {
-    int i, j;
     unsigned char *c;
-    size_t s;
+    size_t s, i, j;
     if (p->s.size == nunits) {
       c = (unsigned char *)(p + p->s.size - nunits + 1);
       s = nunits - 1;