diff --git a/reactos/include/ntdll/ldr.h b/reactos/include/ntdll/ldr.h
index d002bc8e6da..23dede9f72d 100644
--- a/reactos/include/ntdll/ldr.h
+++ b/reactos/include/ntdll/ldr.h
@@ -102,7 +102,7 @@ NTSTATUS LdrMapSections(HANDLE ProcessHandle,
 			PIMAGE_NT_HEADERS NTHeaders);
 NTSTATUS LdrMapNTDllForProcess(HANDLE ProcessHandle,
 			       PHANDLE NTDllSectionHandle);
-
+BOOL LdrMappedAsDataFile(PVOID *BaseAddress);
 
 NTSTATUS STDCALL
 LdrDisableThreadCalloutsForDll(IN PVOID BaseAddress);