diff --git a/libc/kernel/tools/clean_header.py b/libc/kernel/tools/clean_header.py
index bed9926..de4bf85 100755
--- a/libc/kernel/tools/clean_header.py
+++ b/libc/kernel/tools/clean_header.py
@@ -69,6 +69,7 @@
     list.removeVarsAndFuncs( statics )
     list.removeComments()
     list.removeEmptyLines()
+    list.removeMacroDefines( kernel_ignored_macros )
     list.insertDisclaimer( kernel.kernel_disclaimer )
 
     out = StringOutput()