diff --git a/gc.c b/gc.c
index 1f04ce507c..dfcf9b9f88 100644
--- a/gc.c
+++ b/gc.c
@@ -1358,7 +1358,7 @@ obj_free(rb_objspace_t *objspace, VALUE obj)
 	    int free_immediately = 0;
 
 	    if (RTYPEDDATA_P(obj)) {
-		free_immediately = RANY(obj)->as.typeddata.type->flags & RUBY_TYPED_FREE_IMMEDIATELY;
+		free_immediately = (int)(RANY(obj)->as.typeddata.type->flags & RUBY_TYPED_FREE_IMMEDIATELY);
 		RDATA(obj)->dfree = RANY(obj)->as.typeddata.type->function.dfree;
 		if (0 && free_immediately == 0) /* to expose non-free-immediate T_DATA */
 		  fprintf(stderr, "not immediate -> %s\n", RANY(obj)->as.typeddata.type->wrap_struct_name);