diff --git a/src/mapleall/maple_ir/src/bin_mpl_import.cpp b/src/mapleall/maple_ir/src/bin_mpl_import.cpp
index 7b9d6f020550006c3fd8b1befad2fb94abfc23e6..0840f5932a9ed331132da5d0957607192291cc85 100644
--- a/src/mapleall/maple_ir/src/bin_mpl_import.cpp
+++ b/src/mapleall/maple_ir/src/bin_mpl_import.cpp
@@ -1021,7 +1021,7 @@ PUIdx BinaryMplImport::ImportFunction() {
     mod.SetCurFunction(nullptr);
     return 0;
   } else if (tag < 0) {
-    CHECK_FATAL(static_cast<size_t>(-tag) < funcTab.size(), "index out of bounds");
+    CHECK_FATAL(-tag <= funcTab.size(), "index out of bounds");
     if (-tag == funcTab.size()) { // function was exported before its symbol
       return (PUIdx)0;
     }