diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 84f0a37e7..94329f860 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -38,7 +38,7 @@ void invalidFunctionArg_std_string_substr(const std::string &str, std::size_t po
     (void)str.substr(pos,-1);
     // no warning is expected for
     (void)str.substr(pos,len);
-    (void)str.substr(pos, std::wstring::npos);
+    (void)str.substr(pos, std::string::npos);
 }
 
 void invalidFunctionArg_std_wstring_substr(const std::wstring &str, std::size_t pos, std::size_t len) {
@@ -48,7 +48,7 @@ void invalidFunctionArg_std_wstring_substr(const std::wstring &str, std::size_t
     (void)str.substr(pos,-1);
     // no warning is expected for
     (void)str.substr(pos,len);
-    (void)str.substr(pos, std::string::npos);
+    (void)str.substr(pos, std::wstring::npos);
 }
 
 double invalidFunctionArg_log10(double d = 0.0) {