diff --git a/rostests/kmtests/ntos_cc/CcCopyRead_drv.c b/rostests/kmtests/ntos_cc/CcCopyRead_drv.c
index 8def83760d5..7b4b611f104 100644
--- a/rostests/kmtests/ntos_cc/CcCopyRead_drv.c
+++ b/rostests/kmtests/ntos_cc/CcCopyRead_drv.c
@@ -191,9 +191,9 @@ TestIrpHandler(
         else if (IoStack->FileObject->FileName.Length >= 2 * sizeof(WCHAR) &&
                  IoStack->FileObject->FileName.Buffer[1] == 'S')
         {
-            Fcb->Header.AllocationSize.QuadPart = 3000;
-            Fcb->Header.FileSize.QuadPart = 3000;
-            Fcb->Header.ValidDataLength.QuadPart = 3000;
+            Fcb->Header.AllocationSize.QuadPart = 1004;
+            Fcb->Header.FileSize.QuadPart = 1004;
+            Fcb->Header.ValidDataLength.QuadPart = 1004;
         }
         else
         {
diff --git a/rostests/kmtests/ntos_cc/CcCopyRead_user.c b/rostests/kmtests/ntos_cc/CcCopyRead_user.c
index b149a1f2f31..fbcbae5e577 100644
--- a/rostests/kmtests/ntos_cc/CcCopyRead_user.c
+++ b/rostests/kmtests/ntos_cc/CcCopyRead_user.c
@@ -64,6 +64,11 @@ START_TEST(CcCopyRead)
     ok_eq_hex(Status, STATUS_SUCCESS);
     ok_eq_hex(((USHORT *)Buffer)[0], 0xBABA);
 
+    ByteOffset.QuadPart = 999990;
+    Status = NtReadFile(Handle, NULL, NULL, NULL, &IoStatusBlock, Buffer, 10, &ByteOffset, NULL);
+    ok_eq_hex(Status, STATUS_SUCCESS);
+    ok_eq_hex(((USHORT *)Buffer)[0], 0xBABA);
+
     ByteOffset.QuadPart = 1000;
     Status = NtReadFile(Handle, NULL, NULL, NULL, &IoStatusBlock, Buffer, 2, &ByteOffset, NULL);
     ok_eq_hex(Status, STATUS_SUCCESS);