diff --git a/libimagruby/src/store.rs b/libimagruby/src/store.rs
index 8b4bd392..ba3a8343 100644
--- a/libimagruby/src/store.rs
+++ b/libimagruby/src/store.rs
@@ -272,6 +272,11 @@ pub mod store {
 
         pub fn setup_entryheader() -> Class {
             let mut class = Class::new("REntryHeader", None);
+            class.define(|itself| {
+                itself.def("insert", r_entry_header_insert);
+                itself.def("set"   , r_entry_header_set);
+                itself.def("read"  , r_entry_header_get);
+            });
             class
         }