diff --git a/src/mplfe/common/src/fe_function.cpp b/src/mplfe/common/src/fe_function.cpp
index f4a99db0d8745760defba09ca0cc7a7d8e924f3b..58b7485c3e5932885a34568a76bdf76ba6592635 100644
--- a/src/mplfe/common/src/fe_function.cpp
+++ b/src/mplfe/common/src/fe_function.cpp
@@ -430,6 +430,7 @@ bool FEFunction::UpdateFormal(const std::string &phaseName) {
     } else {
       sym = argVar->GenerateMIRSymbol(FEManager::GetMIRBuilder());
     }
+    sym->SetStorageClass(kScFormal);
     mirFunction.AddFormal(sym);
     idx++;
   }