diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 102249d4140a18208e299da6255c22eabccefd99..3f5fb0bbcdaf705ee7af710408bf44e4fb1b49f2 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -103,7 +103,7 @@ void do_store_xer (void)
     xer_so = (T0 >> XER_SO) & 0x01;
     xer_ov = (T0 >> XER_OV) & 0x01;
     xer_ca = (T0 >> XER_CA) & 0x01;
-    xer_bc = (T0 >> XER_BC) & 0x1f;
+    xer_bc = (T0 >> XER_BC) & 0x3f;
 }
 
 void do_load_msr (void)