diff --git a/rubygem-http_parser.rb.spec b/rubygem-http_parser.rb.spec
index d79e205..3d9a340 100644
--- a/rubygem-http_parser.rb.spec
+++ b/rubygem-http_parser.rb.spec
@@ -3,7 +3,7 @@
 
 Name:		rubygem-%{gem_name}
 Version:	0.6.0
-Release:	6%{?dist}
+Release:	7%{?dist}
 Summary:	Simple callback-based HTTP request/response parser
 Group:		Development/Languages
 License:	MIT
@@ -45,6 +45,36 @@ gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
 
 gem build %{gem_name}.gemspec
 
+# FIXME (2018/01/05)
+# With ruby25, rdoc generation segfaults. Disabling for now.
+rm -rf BINDIR
+mkdir BINDIR
+cat > BINDIR/gem << EOF
+#! /bin/bash
+
+args=
+while [ \$# -ge 1 ]
+do
+	arg_o="\$1"
+	case "\$arg_o" in
+	--document=* )
+		arg="--document=ri"
+		;;
+	* )
+		arg="\$arg_o"
+		;;
+	esac
+	args="\$args \$arg"
+	shift
+done
+
+set -x
+exec /usr/bin/gem \$args
+EOF
+
+chmod 0755 BINDIR/gem
+export PATH="$(pwd)/BINDIR:$PATH"
+
 export CONFIGURE_ARGS="--with-cflags='%{optflags}'"
 %gem_install
 
@@ -98,6 +128,10 @@ popd
 %{gem_instdir}/tasks
 
 %changelog
+* Fri Jan 05 2018 Mamoru TASAKA <mtasaka@fedoraproject.org> - 0.6.0-7
+- F-28: rebuild for ruby25
+- Disabling rdoc generation for now to avoid segfault
+
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 0.6.0-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Binutils_Mass_Rebuild