diff --git a/src/SysYIRPrinter.cpp b/src/SysYIRPrinter.cpp
index a27faf0..ae5a3e8 100644
--- a/src/SysYIRPrinter.cpp
+++ b/src/SysYIRPrinter.cpp
@@ -438,7 +438,6 @@ void SysYPrinter::printInst(Instruction *pInst) {
     
     case Kind::kPhi: {
       auto phiInst = dynamic_cast<PhiInst *>(pInst);
-      std::cout << "%";
       printValue(phiInst->getOperand(0));
       std::cout << " = phi ";
       printType(phiInst->getType());