diff --git a/poky/meta/classes/kernel.bbclass b/poky/meta/classes/kernel.bbclass
index a60e15b..bf36742 100644
--- a/poky/meta/classes/kernel.bbclass
+++ b/poky/meta/classes/kernel.bbclass
@@ -454,7 +454,7 @@
 	cp .config $kerneldir/
 	mkdir -p $kerneldir/include/config
 	cp include/config/kernel.release $kerneldir/include/config/kernel.release
-	if [ -e certs/signing_key.pem ]; then
+	if [ -e certs/signing_key.x509 ]; then
 		# The signing_key.* files are stored in the certs/ dir in
 		# newer Linux kernels
 		mkdir -p $kerneldir/certs