diff --git a/src/RISCv64AsmPrinter.cpp b/src/RISCv64AsmPrinter.cpp
index 9482a58..1995024 100644
--- a/src/RISCv64AsmPrinter.cpp
+++ b/src/RISCv64AsmPrinter.cpp
@@ -42,7 +42,7 @@ void RISCv64AsmPrinter::printPrologue() {
         *OS << "    addi sp, sp, -" << aligned_stack_size << "\n";
         *OS << "    sd ra, " << (aligned_stack_size - 8) << "(sp)\n";
         *OS << "    sd s0, " << (aligned_stack_size - 16) << "(sp)\n";
-        *OS << "    mv s0, sp\n";
+        *OS << "    addi s0, sp, " << aligned_stack_size << "\n";
     }
 
     // 忠实还原保存函数入口参数的逻辑