diff --git a/reactos/ntoskrnl/cc/copy.c b/reactos/ntoskrnl/cc/copy.c
index 7162b6ab74e..c6ee11f2f23 100644
--- a/reactos/ntoskrnl/cc/copy.c
+++ b/reactos/ntoskrnl/cc/copy.c
@@ -645,7 +645,10 @@ CcZeroData (IN PFILE_OBJECT     FileObject,
              KeWaitForSingleObject(&Event, Executive, KernelMode, FALSE, NULL);
              Status = Iosb.Status;
 	  }
+        if (Mdl->MdlFlags & MDL_MAPPED_TO_SYSTEM_VA)
+        {
           MmUnmapLockedPages(Mdl->MappedSystemVa, Mdl);
+        }
 	  if (!NT_SUCCESS(Status))
 	    {
 	      return(FALSE);
diff --git a/reactos/ntoskrnl/cc/view.c b/reactos/ntoskrnl/cc/view.c
index 8819a83b3b0..bd52296509c 100644
--- a/reactos/ntoskrnl/cc/view.c
+++ b/reactos/ntoskrnl/cc/view.c
@@ -899,6 +899,7 @@ CcFreeCachePage(PVOID Context, MEMORY_AREA* MemoryArea, PVOID Address,
   ASSERT(SwapEntry == 0);
   if (Page != 0)
     {
+        ASSERT(MmGetReferenceCountPage(Page) == 1);
       MmReleasePageMemoryConsumer(MC_CACHE, Page);
     }
 }