diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 2c77a8b..eb04300 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -444,6 +444,7 @@
 #define H_GET_EM_PARMS          0x2B8
 #define H_SET_MPP               0x2D0
 #define H_GET_MPP               0x2D4
+#define H_HOME_NODE_ASSOCIATIVITY 0x2EC
 #define H_XIRR_X                0x2FC
 #define H_RANDOM                0x300
 #define H_SET_MODE              0x31C