diff --git a/src/maple_ir/src/parser.cpp b/src/maple_ir/src/parser.cpp
index aa382fea18e915f9be3ed1a969024ce37ad50bb0..a2ed490eff41e3a4380ce6f7be1cf6ada697c6ba 100644
--- a/src/maple_ir/src/parser.cpp
+++ b/src/maple_ir/src/parser.cpp
@@ -849,7 +849,7 @@ bool MIRParser::ParseStructType(TyIdx &styIdx) {
     MIRType *prevType = GlobalTables::GetTypeTable().GetTypeFromTyIdx(styIdx);
     ASSERT(prevType->GetKind() == kTypeStruct || prevType->GetKind() == kTypeStructIncomplete,
            "type kind should be consistent.");
-    if (static_cast<MIRStructType*>(prevType)->IsIncomplete() && !(structType.IsIncomplete())) {
+    if (prevType->IsIncomplete() && !(structType.IsIncomplete())) {
       structType.SetNameStrIdx(prevType->GetNameStrIdx());
       structType.SetTypeIndex(styIdx);
       GlobalTables::GetTypeTable().SetTypeWithTyIdx(styIdx, *structType.CopyMIRTypeNode());
@@ -880,7 +880,7 @@ bool MIRParser::ParseClassType(TyIdx &styidx) {
     MIRType *prevType = GlobalTables::GetTypeTable().GetTypeFromTyIdx(styidx);
     ASSERT(prevType->GetKind() == kTypeClass || prevType->GetKind() == kTypeClassIncomplete,
            "type kind should be consistent.");
-    if (static_cast<MIRClassType*>(prevType)->IsIncomplete() && !(classType.IsIncomplete())) {
+    if (prevType->IsIncomplete() && !(classType.IsIncomplete())) {
       classType.SetNameStrIdx(prevType->GetNameStrIdx());
       classType.SetTypeIndex(styidx);
       GlobalTables::GetTypeTable().SetTypeWithTyIdx(styidx, *classType.CopyMIRTypeNode());
@@ -921,9 +921,9 @@ bool MIRParser::ParseInterfaceType(TyIdx &sTyIdx) {
   }
   if (sTyIdx != 0u) {
     MIRType *prevType = GlobalTables::GetTypeTable().GetTypeFromTyIdx(sTyIdx);
-    ASSERT(prevType->GetKind() == kTypeInterface || prevType->GetKind() == kTypeInterfaceIncomplete,
+    ASSERT(prevType->GetKind() == kTypeInterface || prevType->IsIncomplete(),
            "type kind should be consistent.");
-    if (static_cast<MIRInterfaceType*>(prevType)->IsIncomplete() && !(interfaceType.IsIncomplete())) {
+    if (prevType->IsIncomplete() && !(interfaceType.IsIncomplete())) {
       interfaceType.SetNameStrIdx(prevType->GetNameStrIdx());
       interfaceType.SetTypeIndex(sTyIdx);
       GlobalTables::GetTypeTable().SetTypeWithTyIdx(sTyIdx, *interfaceType.CopyMIRTypeNode());
@@ -1511,9 +1511,6 @@ bool MIRParser::ParseTypedef() {
     Error("error passing derived type at ");
     return false;
   }
-  if (prevTyIdx != 0u) {
-  return true;
-  }
   // for class/interface types, prev_tyidx could also be set during processing
   // so we check again right before SetGStrIdxToTyIdx
   if (isLocal) {