diff --git a/rubygem-mustache.spec b/rubygem-mustache.spec
index 9eb4fc5..ec80c08 100644
--- a/rubygem-mustache.spec
+++ b/rubygem-mustache.spec
@@ -2,7 +2,7 @@
 
 Name: rubygem-%{gem_name}
 Version: 1.0.2
-Release: 6%{?dist}
+Release: 7%{?dist}
 Summary: Mustache is a framework-agnostic way to render logic-free views
 Group: Development/Languages
 License: MIT
@@ -70,7 +70,7 @@ sed -r -i '/[Cc]ode[Cc]limate/ s/^/#/' test/helper.rb
 
 # UTF8 environment has to be set.
 # https://github.com/mustache/mustache/issues/208
-LANG=en_US.utf8 ruby -Ilib -e 'Dir.glob "./test/**/*_test.rb", &method(:require)'
+LANG=C.UTF-8 ruby -Ilib -e 'Dir.glob "./test/**/*_test.rb", &method(:require)'
 popd
 
 %files
@@ -93,6 +93,10 @@ popd
 %{gem_instdir}/test
 
 %changelog
+* Sun Nov 18 2018 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 1.0.2-7
+- Use C.UTF-8 locale
+  See https://fedoraproject.org/wiki/Changes/Remove_glibc-langpacks-all_from_buildroot
+
 * Sat Jul 14 2018 Fedora Release Engineering <releng@fedoraproject.org> - 1.0.2-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild