1 files changed, 3 insertions, 1 deletions
diff --git a/object.c b/object.c
index b2580d9904..73ae3d4e2c 100644
--- a/object.c
+++ b/object.c
@@ -595,7 +595,9 @@ rb_mod_initialize(argc, argv, module)
     VALUE *argv;
     VALUE module;
 {
-    rb_mod_module_eval(0, 0, module);
+    if (rb_block_given_p()) {
+	rb_mod_module_eval(0, 0, module);
+    }
     return Qnil;
 }