diff --git a/src/mapleall/maple_me/src/ssa_tab.cpp b/src/mapleall/maple_me/src/ssa_tab.cpp
index 7405f2dc0b0b416a70be868970a542da787483f8..64be6c37af92864d75ecaa22859be96c059a2f37 100644
--- a/src/mapleall/maple_me/src/ssa_tab.cpp
+++ b/src/mapleall/maple_me/src/ssa_tab.cpp
@@ -33,7 +33,11 @@ BaseNode *SSATab::CreateSSAExpr(BaseNode &expr) {
     auto &addrofNode = static_cast<AddrofNode&>(expr);
     AddrofSSANode *ssaNode = mirModule.CurFunction()->GetCodeMemPool()->New<AddrofSSANode>(addrofNode);
     MIRSymbol *st = mirModule.CurFunction()->GetLocalOrGlobalSymbol(ssaNode->GetStIdx());
-    OriginalSt *ost = FindOrCreateSymbolOriginalSt(*st, mirModule.CurFunction()->GetPuidx(), ssaNode->GetFieldID());
+    FieldID fieldId = ssaNode->GetFieldID();
+    if (expr.GetOpCode() == OP_addrof && st->GetType()->GetKind() == kTypeUnion) {
+      fieldId = 0;
+    }
+    OriginalSt *ost = FindOrCreateSymbolOriginalSt(*st, mirModule.CurFunction()->GetPuidx(), fieldId);
     versionStTable.CreateZeroVersionSt(ost);
     ssaNode->SetSSAVar(*versionStTable.GetZeroVersionSt(ost));
     return ssaNode;