1 files changed, 1 insertions, 1 deletions
diff --git a/object.c b/object.c
index 6f36ec7e13..e826cb9f63 100644
--- a/object.c
+++ b/object.c
@@ -776,7 +776,7 @@ rb_to_id(name)
       case T_FIXNUM:
 	id = FIX2LONG(name);
 	if (!rb_id2name(id)) {
-	    rb_raise(rb_eArgError, "%d is not a symbol", id);
+	    rb_raise(rb_eArgError, "%ld is not a symbol", id);
 	}
 	break;
       case T_SYMBOL: