diff --git a/TestProject/RNG/read_csv.hpp b/TestProject/RNG/read_csv.hpp
index f49ab6f..d3666c8 100644
--- a/TestProject/RNG/read_csv.hpp
+++ b/TestProject/RNG/read_csv.hpp
@@ -49,9 +49,9 @@ struct FlowData {
   int length;
   int cols;
   FlowData(string file_name = "D102-1#酸槽数据.csv") {
-    if constexpr (is_same_v<T, double>) {
+    if constexpr (std::is_same_v<T, double>) {
       data = readf(file_name);
-    } else if constexpr (is_same_v<T, int>) {
+    } else if constexpr (std::is_same_v<T, int>) {
       data = readi(file_name);
     }
     length = data.size();