diff --git a/include/utils/LruCache.h b/include/utils/LruCache.h
index af39315..2a70d76 100644
--- a/include/utils/LruCache.h
+++ b/include/utils/LruCache.h
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+#ifndef ANDROID_UTILS_LRU_CACHE_H
+#define ANDROID_UTILS_LRU_CACHE_H
+
 #include <utils/BasicHashtable.h>
 #include <utils/GenerationCache.h>
 #include <utils/UniquePtr.h>
@@ -197,3 +200,5 @@
 }
 
 }
+
+#endif // ANDROID_UTILS_LRU_CACHE_H