diff --git a/tcg/ppc/tcg-target.c b/tcg/ppc/tcg-target.c
index ace5548..5750a2b 100644
--- a/tcg/ppc/tcg-target.c
+++ b/tcg/ppc/tcg-target.c
@@ -258,6 +258,9 @@ static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
         tcg_regset_set32(ct->u.regs, 0, 0xffffffff);
         tcg_regset_reset_reg(ct->u.regs, TCG_REG_R3);
         tcg_regset_reset_reg(ct->u.regs, TCG_REG_R4);
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_R5);
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_R6);
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_R7);
         break;
     case 'K':                   /* qemu_st[8..32] constraint */
         ct->ct |= TCG_CT_REG;
@@ -267,6 +270,7 @@ static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
         tcg_regset_reset_reg(ct->u.regs, TCG_REG_R5);
 #if TARGET_LONG_BITS == 64
         tcg_regset_reset_reg(ct->u.regs, TCG_REG_R6);
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_R7);
 #endif
         break;
     case 'M':                   /* qemu_st64 constraint */