diff --git a/rubygem-ffi.spec b/rubygem-ffi.spec
index a186109..5b0376d 100644
--- a/rubygem-ffi.spec
+++ b/rubygem-ffi.spec
@@ -2,7 +2,7 @@
 
 Name: rubygem-%{gem_name}
 Version: 1.9.18
-Release: 4%{?dist}
+Release: 5%{?dist}
 Summary: FFI Extensions for Ruby
 Group: Development/Languages
 
@@ -43,36 +43,6 @@ gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
 # Create the gem as gem install only works on a gem file
 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"
-
 %gem_install
 
 %install
@@ -122,6 +92,9 @@ popd
 %{gem_instdir}/Rakefile
 
 %changelog
+* Tue Jan 09 2018 Vít Ondruch <vondruch@redhat.com> - 1.9.18-5
+- Re-enable rdoc generation.
+
 * Fri Jan 05 2018 Mamoru TASAKA <mtasaka@fedoraproject.org> - 1.9.18-4
 - F-28: rebuild for ruby25
 - Disabling rdoc generation for now to avoid segfault