diff --git a/libimagruby/src/entry.rs b/libimagruby/src/entry.rs
index ef8d2c21..9c55e72d 100644
--- a/libimagruby/src/entry.rs
+++ b/libimagruby/src/entry.rs
@@ -17,6 +17,8 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+#[allow(unused_variables)]
+
 use std::error::Error;
 
 use ruru::{Class, Object, AnyObject, Boolean, RString, VM, Hash, NilClass, VerifiedObject};
diff --git a/libimagruby/src/imag.rs b/libimagruby/src/imag.rs
index e471fcff..8cec75ba 100644
--- a/libimagruby/src/imag.rs
+++ b/libimagruby/src/imag.rs
@@ -17,6 +17,7 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+#[allow(unused_variables)]
 
 use std::error::Error;
 
diff --git a/libimagruby/src/store.rs b/libimagruby/src/store.rs
index 193ac664..cc8a6626 100644
--- a/libimagruby/src/store.rs
+++ b/libimagruby/src/store.rs
@@ -17,6 +17,8 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+#[allow(unused_variables)]
+
 use libimagstore::store::Store;
 use libimagerror::trace::trace_error;
 use std::error::Error;
diff --git a/libimagruby/src/storeid.rs b/libimagruby/src/storeid.rs
index a8200649..58a21501 100644
--- a/libimagruby/src/storeid.rs
+++ b/libimagruby/src/storeid.rs
@@ -17,6 +17,8 @@
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 //
 
+#[allow(unused_variables)]
+
 use std::path::PathBuf;
 
 use ruru::{Class, Object, AnyObject, Boolean, RString, NilClass, VerifiedObject};