diff --git a/libwvdrmengine/cdm/core/include/cdm_engine.h b/libwvdrmengine/cdm/core/include/cdm_engine.h
index 3a94f0c6..62cf051a 100644
--- a/libwvdrmengine/cdm/core/include/cdm_engine.h
+++ b/libwvdrmengine/cdm/core/include/cdm_engine.h
@@ -343,6 +343,7 @@ class CdmEngine {
 
  protected:
   friend class CdmEngineFactory;
+  friend class ParallelCdmTest;
   friend class WvCdmEnginePreProvTest;
   friend class WvCdmTestBase;
   friend class WvGenericOperationsTest;