diff --git a/arch/powerpc/sysdev/of_rtc.c b/arch/powerpc/sysdev/of_rtc.c
index 3d54450..c9e803f 100644
--- a/arch/powerpc/sysdev/of_rtc.c
+++ b/arch/powerpc/sysdev/of_rtc.c
@@ -12,6 +12,7 @@
 #include <linux/of.h>
 #include <linux/init.h>
 #include <linux/of_platform.h>
+#include <linux/slab.h>
 
 static __initdata struct {
 	const char *compatible;