diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
index aaae85de08fbd629dfacea8bfaf69b67e8f504bd..023e35470760c55997dd6a3d5d8f15c2b02b8f0b 100644
--- a/arch/powerpc/platforms/pseries/mobility.c
+++ b/arch/powerpc/platforms/pseries/mobility.c
@@ -28,7 +28,7 @@ struct update_props_workarea {
 	u32 state;
 	u64 reserved;
 	u32 nprops;
-};
+} __packed;
 
 #define NODE_ACTION_MASK	0xff000000
 #define NODE_COUNT_MASK		0x00ffffff