diff --git a/content/media/gmp/GMPDecryptorChild.cpp b/content/media/gmp/GMPDecryptorChild.cpp
index 3b0a50ffed67..892f29b7751e 100644
--- a/content/media/gmp/GMPDecryptorChild.cpp
+++ b/content/media/gmp/GMPDecryptorChild.cpp
@@ -13,8 +13,10 @@ namespace mozilla {
 namespace gmp {
 
 GMPDecryptorChild::GMPDecryptorChild(GMPChild* aPlugin)
-  : mPlugin(aPlugin)
-  , mSession(nullptr)
+  : mSession(nullptr)
+#ifdef DEBUG
+  , mPlugin(aPlugin)
+#endif
 {
   MOZ_ASSERT(mPlugin);
 }
diff --git a/content/media/gmp/GMPDecryptorChild.h b/content/media/gmp/GMPDecryptorChild.h
index 786518ed33fc..ecc6229f50e4 100644
--- a/content/media/gmp/GMPDecryptorChild.h
+++ b/content/media/gmp/GMPDecryptorChild.h
@@ -114,11 +114,13 @@ private:
 
   virtual bool RecvDecryptingComplete() MOZ_OVERRIDE;
 
-  GMPChild* mPlugin;
-
   // GMP's GMPDecryptor implementation.
   // Only call into this on the (GMP process) main thread.
   GMPDecryptor* mSession;
+
+#ifdef DEBUG
+  GMPChild* mPlugin;
+#endif           
 };
 
 } // namespace gmp