1 files changed, 1 insertions, 0 deletions
diff --git a/gc.c b/gc.c
index 0c007dffe6..4700234e19 100644
--- a/gc.c
+++ b/gc.c
@@ -3648,6 +3648,7 @@ id2ref(VALUE objid)
     VALUE orig;
     void *p0;
 
+    objid = rb_to_int(objid);
     if (FIXNUM_P(objid) || rb_big_size(objid) <= SIZEOF_VOIDP) {
         ptr = NUM2PTR(objid);
         if (ptr == Qtrue) return Qtrue;