diff --git a/tcg/ppc/tcg-target.c b/tcg/ppc/tcg-target.c
index b4e0466083..20888e2e91 100644
--- a/tcg/ppc/tcg-target.c
+++ b/tcg/ppc/tcg-target.c
@@ -244,6 +244,9 @@ 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);
+#if TARGET_LONG_BITS == 64
+        tcg_regset_reset_reg(ct->u.regs, TCG_REG_R5);
+#endif
         break;
     case 'K':                   /* qemu_st[8..32] constraint */
         ct->ct |= TCG_CT_REG;