diff --git a/src/mapleall/maple_ir/src/bin_func_import.cpp b/src/mapleall/maple_ir/src/bin_func_import.cpp
index a010a98e4bb8104ed5537d0bd751f12ac9410d0f..ee225525467aabab881d117e21ea2c7a56ef801a 100644
--- a/src/mapleall/maple_ir/src/bin_func_import.cpp
+++ b/src/mapleall/maple_ir/src/bin_func_import.cpp
@@ -706,7 +706,7 @@ BlockNode *BinaryMplImport::ImportBlockNode(MIRFunction *func) {
         s->SetDefaultLabel(ReadNum());
         uint32 tagSize = ReadNum();
         for (uint32 i = 0; i < tagSize; i++) {
-          int32 casetag = ReadNum();
+          int64 casetag = ReadNum();
           LabelIdx lidx(ReadNum());
           CasePair cpair = std::make_pair(casetag, lidx);
           s->GetSwitchTable().push_back(cpair);