diff --git a/arch/powerpc/lib/bat_rw.c b/arch/powerpc/lib/bat_rw.c
index c48c240..113c293 100644
--- a/arch/powerpc/lib/bat_rw.c
+++ b/arch/powerpc/lib/bat_rw.c
@@ -26,6 +26,7 @@
 #include <asm/processor.h>
 #include <asm/mmu.h>
 #include <asm/io.h>
+#include <linux/compiler.h>
 
 #ifdef CONFIG_ADDR_MAP
 #include <addr_map.h>
@@ -35,7 +36,7 @@
 
 int write_bat (ppc_bat_t bat, unsigned long upper, unsigned long lower)
 {
-	int batn = -1;
+	__maybe_unused int batn = -1;
 
 	sync();