diff --git a/lib/ntdllsys/CMakeLists.txt b/lib/ntdllsys/CMakeLists.txt
index 6066b9b04ea..aebea333781 100644
--- a/lib/ntdllsys/CMakeLists.txt
+++ b/lib/ntdllsys/CMakeLists.txt
@@ -1,2 +1,4 @@
+
+set_source_files_properties(${REACTOS_BINARY_DIR}/lib/ntdllsys/ntdll.S PROPERTIES GENERATED TRUE)
 add_library(ntdllsys ${REACTOS_BINARY_DIR}/lib/ntdllsys/ntdll.S)
 add_dependencies(ntdllsys ntdll_S)
diff --git a/lib/win32ksys/CMakeLists.txt b/lib/win32ksys/CMakeLists.txt
index f92d87e3ce8..1a7a3e30f82 100644
--- a/lib/win32ksys/CMakeLists.txt
+++ b/lib/win32ksys/CMakeLists.txt
@@ -1,2 +1,4 @@
+
+set_source_files_properties(${REACTOS_BINARY_DIR}/lib/win32ksys/win32k.S PROPERTIES GENERATED TRUE)
 add_library(win32ksys ${REACTOS_BINARY_DIR}/lib/win32ksys/win32k.S)
 add_dependencies(win32ksys win32k_S)