diff --git a/src/main/java/org/junit/experimental/categories/Categories.java b/src/main/java/org/junit/experimental/categories/Categories.java
index 0c73ed82afff..f4a01a964928 100644
--- a/src/main/java/org/junit/experimental/categories/Categories.java
+++ b/src/main/java/org/junit/experimental/categories/Categories.java
@@ -278,6 +278,7 @@ private static Set<Class<?>> categories(Description description) {
             Set<Class<?>> categories= new HashSet<Class<?>>();
             Collections.addAll(categories, directCategories(description));
             Collections.addAll(categories, directCategories(parentDescription(description)));
+            Collections.addAll(categories, directCategories(declaringDescription(description)));
             return categories;
         }
 
@@ -286,6 +287,14 @@ private static Description parentDescription(Description description) {
             return testClass == null ? null : Description.createSuiteDescription(testClass);
         }
 
+        private static Description declaringDescription(Description description) {
+            Class<?> testClass = description.getTestClass();
+            if (testClass != null) {
+                testClass = testClass.getDeclaringClass();
+            }
+            return testClass == null ? null : Description.createSuiteDescription(testClass);
+        }
+
         private static Class<?>[] directCategories(Description description) {
             if (description == null) {
                 return new Class<?>[0];