diff --git a/include/pocketpy/expr.h b/include/pocketpy/expr.h
index f3b883d8..7211c0c8 100644
--- a/include/pocketpy/expr.h
+++ b/include/pocketpy/expr.h
@@ -56,7 +56,7 @@ struct CodeEmitContext{
     int for_loop_depth = 0;
 
     std::map<void*, int> _co_consts_nonstring_dedup_map;
-    std::map<std::string_view, int> _co_consts_string_dedup_map;
+    std::map<std::string, int> _co_consts_string_dedup_map;
 
     int get_loop() const;
     CodeBlock* enter_block(CodeBlockType type);
diff --git a/src/expr.cpp b/src/expr.cpp
index eae7961b..358c8f97 100644
--- a/src/expr.cpp
+++ b/src/expr.cpp
@@ -89,7 +89,7 @@ namespace pkpy{
     int CodeEmitContext::add_const(PyObject* v){
         if(is_non_tagged_type(v, vm->tp_str)){
             // string deduplication
-            std::string_view key = PK_OBJ_GET(Str, v).sv();
+            std::string key = PK_OBJ_GET(Str, v).str();
             auto it = _co_consts_string_dedup_map.find(key);
             if(it != _co_consts_string_dedup_map.end()){
                 return it->second;