diff --git a/css-frontend/src/main/java/org/sonar/css/parser/less/LessGrammar.java b/css-frontend/src/main/java/org/sonar/css/parser/less/LessGrammar.java
index 6f9cb2c3..b9d288ea 100644
--- a/css-frontend/src/main/java/org/sonar/css/parser/less/LessGrammar.java
+++ b/css-frontend/src/main/java/org/sonar/css/parser/less/LessGrammar.java
@@ -116,6 +116,7 @@ public Tree ANY_WITHOUT_COMMA_SEPARATED_LIST() {
         PSEUDO_SELECTOR(),
         PARENTHESIS_BLOCK(),
         BRACKET_BLOCK(),
+        STATEMENT_BLOCK(),
         PERCENTAGE(),
         DIMENSION(),
         NUMBER(),
diff --git a/css-frontend/src/test/java/org/sonar/css/parser/less/StyleSheetTreeTest.java b/css-frontend/src/test/java/org/sonar/css/parser/less/StyleSheetTreeTest.java
index bdc6dd3a..eb8b9b57 100644
--- a/css-frontend/src/test/java/org/sonar/css/parser/less/StyleSheetTreeTest.java
+++ b/css-frontend/src/test/java/org/sonar/css/parser/less/StyleSheetTreeTest.java
@@ -155,6 +155,27 @@ public void stylesheet() throws Exception {
       "}\n" +
       ".sprites(@sprites, @i + 1);\n" +
       "}");
+
+    checkParsed("// declare detached ruleset\n" +
+      "@detached-ruleset: { background: red; };\n" +
+      "\n" +
+      "// use detached ruleset\n" +
+      ".top {\n" +
+      "    @detached-ruleset(); \n" +
+      "}");
+
+    checkParsed(".desktop-and-old-ie(@rules) {\n" +
+      "  @media screen and (min-width: 1200px) { @rules(); }\n" +
+      "  html.lt-ie9 &                         { @rules(); }\n" +
+      "}\n" +
+      "\n" +
+      "header {\n" +
+      "  background-color: blue;\n" +
+      "\n" +
+      "  .desktop-and-old-ie({\n" +
+      "    background-color: red;\n" +
+      "  });\n" +
+      "}");
   }
 
   private StyleSheetTree checkParsed(String toParse) {