diff --git a/src/mapleall/maple_me/src/alias_class.cpp b/src/mapleall/maple_me/src/alias_class.cpp
index 0e0896110abbe1d14afcb0baa9c4ac52e1f2558c..c6c884e480bb9bae02a633fce4f72f5b02940e8f 100644
--- a/src/mapleall/maple_me/src/alias_class.cpp
+++ b/src/mapleall/maple_me/src/alias_class.cpp
@@ -992,9 +992,8 @@ void AliasClass::CollectMayDefForDassign(const StmtNode &stmt, std::set<Original
           continue;
         }
         if (lhsAeType->HasFields()) {
-          if ((ostOfAliasAe->GetFieldID() < ostOfLhsAe->GetFieldID()) ||
-              (ostOfAliasAe->GetFieldID() >
-               (ostOfLhsAe->GetFieldID() + static_cast<int32>(lhsAeType->NumberOfFieldIDs())))) {
+          if (fldIDB < fldIDA ||
+              fldIDB > fldIDA + static_cast<int32>(lhsAeType->NumberOfFieldIDs())) {
             if (!aliasAeType->HasFields()) {
               continue;
             }
@@ -1009,6 +1008,7 @@ void AliasClass::CollectMayDefForDassign(const StmtNode &stmt, std::set<Original
           }
         }
       }
+      (void)mayDefOsts.insert(ostOfAliasAe);
     }
   }
 }