diff --git a/lib/rules/mixins-before-declarations.js b/lib/rules/mixins-before-declarations.js
index 5499646e..982e15ee 100644
--- a/lib/rules/mixins-before-declarations.js
+++ b/lib/rules/mixins-before-declarations.js
@@ -11,35 +11,37 @@ module.exports = {
     ]
   },
   'detect': function (ast, parser) {
-    var result = [],
-        error;
+    var result = [];
+    var error;
 
-    ast.traverseByType('block', function (block) {
-      var lastDeclaration = null;
-      block.traverse(function (item, j) {
-        if (item.type === 'include') {
-          if (j > lastDeclaration && lastDeclaration !== null) {
-            item.forEach('simpleSelector', function (name) {
-              if (parser.options.exclude.indexOf(name.content[0].content) === -1) {
-                error = {
-                  'ruleId': parser.rule.name,
-                  'line': item.start.line,
-                  'column': item.start.column,
-                  'message': 'Mixins should come before declarations',
-                  'severity': parser.severity
-                };
-                result = helpers.addUnique(result, error);
-              }
-            });
-          }
+    ast.traverseByType('include', function (node, i, parent) {
+      var depth = 0;
+      var declarationCount = [depth];
+
+      parent.traverse( function (item) {
+        if (item.type === 'ruleset') {
+          depth++;
+          declarationCount[depth] = 0;
         }
         if (item.type === 'declaration') {
-          lastDeclaration = j;
+          declarationCount[depth]++;
+        }
+        else if (item.type === 'include') {
+          item.forEach('simpleSelector', function (name) {
+            if (parser.options.exclude.indexOf(name.content[0].content) === -1 && declarationCount[depth] > 0) {
+              error = {
+                'ruleId': parser.rule.name,
+                'line': item.start.line,
+                'column': item.start.column,
+                'message': 'Mixins should come before declarations',
+                'severity': parser.severity
+              };
+              result = helpers.addUnique(result, error);
+            }
+          });
         }
       });
-      lastDeclaration = null;
     });
-
     return result;
   }
 };