diff --git a/reactos/ntoskrnl/ntoskrnl.def b/reactos/ntoskrnl/ntoskrnl.def
index 35b1dcfb15a..871a76e4e3a 100644
--- a/reactos/ntoskrnl/ntoskrnl.def
+++ b/reactos/ntoskrnl/ntoskrnl.def
@@ -50,7 +50,6 @@ CcUnpinDataForThread@8
 CcUnpinRepinnedBcb@12
 CcWaitForCurrentLazyWriterActivity@0
 CcSetFileSizes@8
-CcUnpinData@4
 CcZeroData@16
 CmRegisterCallback@12
 CmUnRegisterCallback@8