diff --git a/marisa.spec b/marisa.spec
index 0669772..84fc31f 100644
--- a/marisa.spec
+++ b/marisa.spec
@@ -84,16 +84,19 @@ sed -i 's|^hardcode_libdir_flag_spec=.*|hardcode_libdir_flag_spec=""|g' libtool
 sed -i 's|^runpath_var=LD_RUN_PATH|runpath_var=DIE_RPATH_DIE|g' libtool
 make %{?_smp_mflags}
 
+# build Perl bindings
 pushd bindings/perl
 %{__perl} Makefile.PL INC="-I%{_builddir}/%{name}-%{version}/lib" LIBS="-L%{_builddir}/%{name}-%{version}/lib/.libs"
 make %{?_smp_mflags}
 popd
 
+# build Python bindings
 pushd bindings/python
 %{__python} setup.py build_ext --include-dirs="%{_builddir}/%{name}-%{version}/lib" --library-dirs="%{_builddir}/%{name}-%{version}/lib/.libs"
 %{__python} setup.py build
 popd
 
+# build Ruby bindings
 pushd bindings/ruby
 ruby extconf.rb --with-opt-include="%{_builddir}/%{name}-%{version}/lib" --with-opt-lib="%{_builddir}/%{name}-%{version}/lib/.libs"
 make
@@ -114,7 +117,7 @@ popd
 
 # install Ruby bindings
 pushd bindings/ruby
-%make_install INSTALL="install -p"
+%make_install INSTALL="install -p" hdrdir=%{_includedir} rubyhdrdir=%{_includedir}
 popd
 
 find $RPM_BUILD_ROOT -name '*.la' -exec rm -f {} ';'