diff --git a/src/unit_test.cpp b/src/unit_test.cpp
index e4ec4e0..989106c 100644
--- a/src/unit_test.cpp
+++ b/src/unit_test.cpp
@@ -264,26 +264,27 @@ static bool checkDataConversionsProduceExpected(void){
 }
 
 static bool CheckForUtfEnvironment(void) {
-	ILogMessage("\tChecking for UTF locale. ☹");
+	ILogMessage("\tChecking for UTF locale. ☺");
 	try {
 		bool utfEnvironment{ true };
+		std::string cum{};
 		if constexpr (b_WINDOWS) {
 			auto ACP{ GetACP() };
 			// Check that windows thinks this is UTF8
 			utfEnvironment = utfEnvironment && (ACP == 65001);
 			if (!utfEnvironment) {
-				szError = std::format("current code page {}, —should be 65001☹, ", ACP);
+				cum += std::format("current code page {}, —should be 65001☹, ", ACP);
 			}
 		}
 		auto FontEncoding{ wxLocale::GetSystemEncoding() };
 		// check that wxWidgets thinks this is UTF8
 		utfEnvironment = utfEnvironment && (FontEncoding == wxFONTENCODING_UTF8);
 		if (!utfEnvironment) {
-			szError += std::format("swxFontEncoding {}, – should be {} ☹",
+			cum += std::format("swxFontEncoding {}, —should be {} ☹",
 				(int)FontEncoding,
 				(int)wxFONTENCODING_UTF8
 			);
-			throw MyException(szError, __LINE__, __func__, SrcFilename);
+			throw MyException(cum, __LINE__, __func__, SrcFilename);
 		}
 	}
 	catch (const MyException& e) {