diff --git a/lib/sbi/sbi_emulate_csr.c b/lib/sbi/sbi_emulate_csr.c
index 5d6819e..791890f 100644
--- a/lib/sbi/sbi_emulate_csr.c
+++ b/lib/sbi/sbi_emulate_csr.c
@@ -83,8 +83,8 @@ int sbi_emulate_csr_read(int csr_num, u32 hartid, ulong mstatus,
 		*csr_val = csr_read(CSR_MHPMEVENT4);
 		break;
 	default:
-		sbi_printf("%s: hartid%d: invalid csr_num=0x%x\n", __func__,
-			   hartid, csr_num);
+		sbi_dprintf(scratch, "%s: hartid%d: invalid csr_num=0x%x\n",
+			    __func__, hartid, csr_num);
 		return SBI_ENOTSUPP;
 	};
 
@@ -128,8 +128,8 @@ int sbi_emulate_csr_write(int csr_num, u32 hartid, ulong mstatus,
 		csr_write(CSR_MHPMEVENT4, csr_val);
 		break;
 	default:
-		sbi_printf("%s: hartid%d: invalid csr_num=0x%x\n", __func__,
-			   hartid, csr_num);
+		sbi_dprintf(scratch, "%s: hartid%d: invalid csr_num=0x%x\n",
+			    __func__, hartid, csr_num);
 		return SBI_ENOTSUPP;
 	};