diff --git a/power_fv/insn/const.py b/power_fv/insn/const.py
index 63f5dfe..0d7ff13 100644
--- a/power_fv/insn/const.py
+++ b/power_fv/insn/const.py
@@ -271,5 +271,5 @@ class MTSRR0  (WordInsn): _fields = (f.PO(31), f.RS(), f.SPR( 26), f.XO_XFX(467)
 class MFSRR0  (WordInsn): _fields = (f.PO(31), f.RT(), f.SPR( 26), f.XO_XFX(339))
 class MTSRR1  (WordInsn): _fields = (f.PO(31), f.RS(), f.SPR( 27), f.XO_XFX(467))
 class MFSRR1  (WordInsn): _fields = (f.PO(31), f.RT(), f.SPR( 27), f.XO_XFX(339))
-class MTTAR   (WordInsn): _fields = (f.PO(31), f.RS(), f.SPR(815), f.XO_XFX(467))
-class MFTAR   (WordInsn): _fields = (f.PO(31), f.RT(), f.SPR(815), f.XO_XFX(339))
+class MTTAR   (WordInsn): _fields = (f.PO(31), f.RS(), f.SPR(814), f.XO_XFX(467))
+class MFTAR   (WordInsn): _fields = (f.PO(31), f.RT(), f.SPR(814), f.XO_XFX(339))