diff --git a/ruby.spec b/ruby.spec
index fe10e15..8dfcc9e 100644
--- a/ruby.spec
+++ b/ruby.spec
@@ -471,25 +471,25 @@ mv %{buildroot}%{ruby_libarchdir}/psych.so %{buildroot}%{_libdir}/gems/exts/psyc
 mv %{buildroot}%{gem_dir}/specifications/default/psych-%{psych_version}.gemspec %{buildroot}%{gem_dir}/specifications
 
 # Adjust the gemspec files so that the gems will load properly
-sed -i '8 a\
+sed -i '/^end$/ i\
   s.require_paths = ["lib"]' %{buildroot}%{gem_dir}/specifications/rake-%{rake_version}.gemspec
 
-sed -i '8 a\
+sed -i '/^end$/ i\
   s.require_paths = ["lib"]' %{buildroot}%{gem_dir}/specifications/rdoc-%{rdoc_version}.gemspec
 
-sed -i '8 a\
+sed -i '/^end$/ i\
   s.require_paths = ["lib"]\
   s.extensions = ["bigdecimal.so"]' %{buildroot}%{gem_dir}/specifications/bigdecimal-%{bigdecimal_version}.gemspec
 
-sed -i '8 a\
+sed -i '/^end$/ i\
   s.require_paths = ["lib"]\
   s.extensions = ["io/console.so"]' %{buildroot}%{gem_dir}/specifications/io-console-%{io_console_version}.gemspec
 
-sed -i '8 a\
+sed -i '/^end$/ i\
   s.require_paths = ["lib"]\
   s.extensions = ["json/ext/parser.so", "json/ext/generator.so"]' %{buildroot}%{gem_dir}/specifications/json-%{json_version}.gemspec
 
-sed -i '8 a\
+sed -i '/^end$/ i\
   s.require_paths = ["lib"]' %{buildroot}%{gem_dir}/specifications/minitest-%{minitest_version}.gemspec
 
 %check