diff --git a/include/media/ICrypto.h b/include/media/ICrypto.h
index aa04dbe..ea316de 100644
--- a/include/media/ICrypto.h
+++ b/include/media/ICrypto.h
@@ -25,7 +25,7 @@
 namespace android {
 
 struct AString;
-struct IMemory;
+class IMemory;
 
 struct ICrypto : public IInterface {
     DECLARE_META_INTERFACE(Crypto);