diff --git a/man-pages-ja.spec b/man-pages-ja.spec
index 71f787f..5108c28 100644
--- a/man-pages-ja.spec
+++ b/man-pages-ja.spec
@@ -4,7 +4,7 @@ Release: 1%{?dist}
 # Actual license for each Japanese manpages is the same to the original English manpages' license.
 License: Freely redistributable without restriction
 BuildArch: noarch
-BuildRequires: perl(Env)
+BuildRequires: perl(Env), perl(Encode)
 URL: http://linuxjm.osdn.jp/
 
 Source: http://linuxjm.osdn.jp/%{name}-%{version}.tar.gz