diff --git a/runtime/mirror/class.h b/runtime/mirror/class.h
index 15f0fd3..642d675 100644
--- a/runtime/mirror/class.h
+++ b/runtime/mirror/class.h
@@ -78,9 +78,6 @@
 class Method;
 template <typename T> struct PACKED(8) DexCachePair;
 
-using StringDexCachePair = DexCachePair<String>;
-using StringDexCacheType = std::atomic<StringDexCachePair>;
-
 // C++ mirror of java.lang.Class
 class EXPORT MANAGED Class final : public Object {
  public: