1 files changed, 6 insertions, 0 deletions
diff --git a/node_modules/clean-css/lib/writer/helpers.js b/node_modules/clean-css/lib/writer/helpers.js
index ab08633e8..da13cf6eb 100644
--- a/node_modules/clean-css/lib/writer/helpers.js
+++ b/node_modules/clean-css/lib/writer/helpers.js
@@ -87,6 +87,12 @@ function property(context, tokens, position, lastPropertyAt) {
       store(context, token);
       store(context, semicolon(context, Breaks.AfterProperty, false));
       break;
+    case Token.AT_RULE_BLOCK:
+      rules(context, token[1]);
+      store(context, openBrace(context, Breaks.AfterRuleBegins, true));
+      body(context, token[2]);
+      store(context, closeBrace(context, Breaks.AfterRuleEnds, false, isLast));
+      break;
     case Token.COMMENT:
       store(context, token);
       break;