diff --git a/debian/rules b/debian/rules
index 32ab69d..57ab5ab 100755
--- a/debian/rules
+++ b/debian/rules
@@ -132,7 +132,7 @@ debian/${PVE_KERNEL_PKG}.%: debian/templates/pve-kernel.%.in
 		NO_LIBPYTHON=1 \
 		NO_LIBPERL=1 \
 		NO_LIBCRYPTO=1 \
-		CFLAGS="${PVE_KERNEL_CFLAGS}" \
+		EXTRA_CFLAGS="${PVE_KERNEL_CFLAGS}" \
 		PYTHON=python3
 #	echo "checking GPL-2 only perf binary for library linkage with incompatible licenses.."
 #	! ldd ${KERNEL_SRC}/tools/perf/perf | grep -q -E '\blibbfd'