diff --git a/liborcus.spec b/liborcus.spec
index 5c12d6a..df95833 100644
--- a/liborcus.spec
+++ b/liborcus.spec
@@ -16,6 +16,7 @@ Source0: http://kohei.us/files/orcus/src/%{name}-%{version}.tar.xz
 
 BuildRequires: boost-devel
 BuildRequires: doxygen
+BuildRequires: gcc-c++
 %if %{with convtools}
 BuildRequires: help2man
 BuildRequires: pkgconfig(libixion-0.13)