diff --git a/src/mapleall/maple_be/src/cg/rematerialize.cpp b/src/mapleall/maple_be/src/cg/rematerialize.cpp
index a9db0a12cc54c2ed0e5938bde0b29bb40fb83a1b..17387a930c44417323a5d078c90f7f26534dba85 100644
--- a/src/mapleall/maple_be/src/cg/rematerialize.cpp
+++ b/src/mapleall/maple_be/src/cg/rematerialize.cpp
@@ -138,7 +138,7 @@ std::vector<Insn*> Rematerializer::Rematerialize(CGFunc &cgFunc, RegOperand &reg
       const MIRSymbol *symbol = rematInfo.sym;
       int32 offset = 0;
       if (fieldID != 0) {
-        ASSERT(symbol->GetType()->IsMIRStructType(), "non-zero fieldID for non-structure");
+        ASSERT(symbol->GetType()->IsMIRStructType() || symbol->GetType()->IsMIRUnionType(), "non-zero fieldID for non-structure");
         MIRStructType *structType = static_cast<MIRStructType*>(symbol->GetType());
         offset = cgFunc.GetBecommon().GetFieldOffset(*structType, fieldID).first;
       }
@@ -151,4 +151,4 @@ std::vector<Insn*> Rematerializer::Rematerialize(CGFunc &cgFunc, RegOperand &reg
   return std::vector<Insn*>();
 }
 
-}  /* namespace maplebe */
\ No newline at end of file
+}  /* namespace maplebe */