diff --git a/rubygem-thin.spec b/rubygem-thin.spec
index d1572cc..fb81da2 100644
--- a/rubygem-thin.spec
+++ b/rubygem-thin.spec
@@ -2,7 +2,7 @@
 
 Name: rubygem-%{gem_name}
 Version: 1.7.2
-Release: 3%{?dist}
+Release: 4%{?dist}
 Summary: A thin and fast web server
 # lib/thin/stats.html.erb: BSD
 # spec/rails_app/public/javascripts/*.js: MIT
@@ -79,11 +79,17 @@ find spec/perf -name "*_spec.rb" -exec \
 
 # The 'should force kill process in pid file' spec is not compatible with RSpec2.
 # https://github.com/rspec/rspec-core/issues/520
-sed -i -r "/'should (force )?kill process in pid file'/a \    pending" spec/daemonizing_spec.rb
+sed -i -r "/'should (force )?kill process in pid file'/a \    pending" \
+    spec/daemonizing_spec.rb
+
+# To prevent timeout error on ppc64 arch.
+sed -i '/^    def server_should_start_in_less_then/,/^    end/ s/(10)/(20)/' \
+    spec/daemonizing_spec.rb
 
 # These 2 tests are passing independently, but fails when running with the
 # whole testsuite.
-sed -i '/"tracing routines (with NO custom logger)"/a \    before { pending }' spec/logging_spec.rb
+sed -i '/"tracing routines (with NO custom logger)"/a \    before { pending }' \
+    spec/logging_spec.rb
 
 rspec2 -I$(dirs +1)%{gem_extdir_mri} spec
 
@@ -106,6 +112,9 @@ popd
 %{gem_instdir}/Rakefile
 
 %changelog
+* Tue Aug 08 2017 Jun Aruga <jaruga@redhat.com> - 1.7.2-4
+- Fix FTBFS.
+
 * Thu Aug 03 2017 Fedora Release Engineering <releng@fedoraproject.org> - 1.7.2-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_27_Binutils_Mass_Rebuild