diff --git a/kernel.spec b/kernel.spec
index 478ef86c3..7fb536986 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -365,6 +365,7 @@ Summary: The Linux kernel
 %define kernel_image vmlinux
 %define kernel_image_elf 1
 %define all_arch_configs kernel-%{version}-ppc64le*.config
+%define kcflags -O3
 %endif
 
 %ifarch s390x