diff --git a/libwvdrmengine/cdm/core/include/max_res_engine.h b/libwvdrmengine/cdm/core/include/max_res_engine.h
index e3cb7a3f..d1692fc7 100644
--- a/libwvdrmengine/cdm/core/include/max_res_engine.h
+++ b/libwvdrmengine/cdm/core/include/max_res_engine.h
@@ -78,6 +78,8 @@ class MaxResEngine {
     ConstraintList constraints_;
   };
 
+  typedef std::map<wvcdm::KeyId, KeyStatus*>::const_iterator KeyIterator;
+
   void Init(CryptoSession* crypto_session, Clock* clock);
 
   void DeleteAllKeys();
diff --git a/libwvdrmengine/cdm/core/src/max_res_engine.cpp b/libwvdrmengine/cdm/core/src/max_res_engine.cpp
index 5be5a2b4..3daf1d5d 100644
--- a/libwvdrmengine/cdm/core/src/max_res_engine.cpp
+++ b/libwvdrmengine/cdm/core/src/max_res_engine.cpp
@@ -7,9 +7,6 @@
 
 namespace {
 
-typedef std::map<wvcdm::KeyId, wvcdm::MaxResEngine::KeyStatus*>::const_iterator
-    KeyIterator;
-
 const int64_t kHdcpCheckInterval = 10;
 const uint32_t kNoResolution = 0;