1 files changed, 1 insertions, 1 deletions
diff --git a/vm.c b/vm.c
index ed4d31e95f..55ccfe7939 100644
--- a/vm.c
+++ b/vm.c
@@ -1857,7 +1857,7 @@ vm_define_method(rb_thread_t *th, VALUE obj, ID id, VALUE iseqval,
     }
 
     if (is_singleton) {
-	if (FIXNUM_P(obj) || SYMBOL_P(obj)) {
+	if (FIXNUM_P(obj) || FLONUM_P(obj) || SYMBOL_P(obj)) {
 	    rb_raise(rb_eTypeError,
 		     "can't define singleton method \"%s\" for %s",
 		     rb_id2name(id), rb_obj_classname(obj));