diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3a82840c385..bb87afef355 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -135,6 +135,8 @@ add_custom_command(
     COMMAND native-nci -arch ${ARCH} ${REACTOS_SOURCE_DIR}/ntoskrnl/sysfuncs.lst ${REACTOS_SOURCE_DIR}/subsystems/win32/win32k/w32ksvc.db ${nci_output}
     DEPENDS native-nci ${nci_folders})
 
+set_source_files_properties(${nci_output} PROPERTIES GENERATED TRUE)
+
 add_custom_target(ntdll_S ALL DEPENDS ${REACTOS_BINARY_DIR}/lib/ntdllsys/ntdll.S)
 add_custom_target(win32k_S ALL DEPENDS ${REACTOS_BINARY_DIR}/lib/win32ksys/win32k.S)
 add_custom_target(ntsys_pspec ALL DEPENDS ${REACTOS_BINARY_DIR}/dll/ntdll/def/ntsys.pspec)