diff --git a/arch/powerpc/kernel/swsusp_64.c b/arch/powerpc/kernel/swsusp_64.c
index 16ee3baaf09a..50fa8fc9ef95 100644
--- a/arch/powerpc/kernel/swsusp_64.c
+++ b/arch/powerpc/kernel/swsusp_64.c
@@ -11,6 +11,8 @@
 #include <linux/interrupt.h>
 #include <linux/nmi.h>
 
+void do_after_copyback(void);
+
 void do_after_copyback(void)
 {
 	iommu_restore();