diff --git a/lib/sbi/sbi_ecall_cppc.c b/lib/sbi/sbi_ecall_cppc.c
index c26bb401..dab78299 100644
--- a/lib/sbi/sbi_ecall_cppc.c
+++ b/lib/sbi/sbi_ecall_cppc.c
@@ -32,7 +32,13 @@ static int sbi_ecall_cppc_handler(unsigned long extid, unsigned long funcid,
 #endif
 		break;
 	case SBI_EXT_CPPC_WRITE:
-		ret = sbi_cppc_write(regs->a0, regs->a1);
+#if __riscv_xlen == 32
+		temp = regs->a2;
+		temp = (temp << 32) | regs->a1;
+#else
+		temp = regs->a1;
+#endif
+		ret = sbi_cppc_write(regs->a0, temp);
 		break;
 	case SBI_EXT_CPPC_PROBE:
 		ret = sbi_cppc_probe(regs->a0);