diff --git a/arch/powerpc/mm/slb.c b/arch/powerpc/mm/slb.c
index 9f574e59d178618af5ba5056f13241f0776f9852..2f162c6e52d4f1632e53e2cee263b3b007e8b838 100644
--- a/arch/powerpc/mm/slb.c
+++ b/arch/powerpc/mm/slb.c
@@ -355,7 +355,7 @@ void slb_initialize(void)
 #endif
 	}
 
-	get_paca()->stab_rr = SLB_NUM_BOLTED;
+	get_paca()->stab_rr = SLB_NUM_BOLTED - 1;
 
 	lflags = SLB_VSID_KERNEL | linear_llp;
 	vflags = SLB_VSID_KERNEL | vmalloc_llp;