diff --git a/MagickCore/cache-private.h b/MagickCore/cache-private.h
index efdd39a..4a9a277 100644
--- a/MagickCore/cache-private.h
+++ b/MagickCore/cache-private.h
@@ -41,9 +41,9 @@
typedef MagickBooleanType
(*GetOneAuthenticPixelFromHandler)(Image *,const ssize_t,const ssize_t,
- PixelPacket *,ExceptionInfo *),
+ Quantum *,ExceptionInfo *),
(*GetOneVirtualPixelFromHandler)(const Image *,const VirtualPixelMethod,
- const ssize_t,const ssize_t,PixelPacket *,ExceptionInfo *),
+ const ssize_t,const ssize_t,Quantum *,ExceptionInfo *),
(*SyncAuthenticPixelsHandler)(Image *,ExceptionInfo *);
typedef const Quantum