diff --git a/tests/wchar_test.cpp b/tests/wchar_test.cpp
index a7e49e8c6..eb23cf3f7 100644
--- a/tests/wchar_test.cpp
+++ b/tests/wchar_test.cpp
@@ -782,20 +782,20 @@ void TestSingleWcsToFloat(WcsToFloatFn<T> fn, const wchar_t* str,
 
 template <typename T>
 void TestWcsToFloat(WcsToFloatFn<T> fn) {
-  TestSingleWcsToFloat(fn, L"123", static_cast<T>(123.0), 3);
-  TestSingleWcsToFloat(fn, L"123#", static_cast<T>(123.0), 3);
-  TestSingleWcsToFloat(fn, L"   123 45", static_cast<T>(123.0), 6);
-  TestSingleWcsToFloat(fn, L"9.0", static_cast<T>(9.0), 3);
-  TestSingleWcsToFloat(fn, L"-9.0", static_cast<T>(-9.0), 4);
-  TestSingleWcsToFloat(fn, L" \t\v\f\r\n9.0", static_cast<T>(9.0), 9);
+  TestSingleWcsToFloat(fn, L"123", static_cast<T>(123.0L), 3);
+  TestSingleWcsToFloat(fn, L"123#", static_cast<T>(123.0L), 3);
+  TestSingleWcsToFloat(fn, L"   123 45", static_cast<T>(123.0L), 6);
+  TestSingleWcsToFloat(fn, L"9.0", static_cast<T>(9.0L), 3);
+  TestSingleWcsToFloat(fn, L"-9.0", static_cast<T>(-9.0L), 4);
+  TestSingleWcsToFloat(fn, L" \t\v\f\r\n9.0", static_cast<T>(9.0L), 9);
 }
 
 template <typename T>
 void TestWcsToFloatHexFloats(WcsToFloatFn<T> fn) {
-  TestSingleWcsToFloat(fn, L"0.9e1", static_cast<T>(9.0), 5);
-  TestSingleWcsToFloat(fn, L"0x1.2p3", static_cast<T>(9.0), 7);
-  TestSingleWcsToFloat(fn, L"+1e+100", static_cast<T>(1e100), 7);
-  TestSingleWcsToFloat(fn, L"0x10000.80", static_cast<T>(65536.50), 10);
+  TestSingleWcsToFloat(fn, L"0.9e1", static_cast<T>(9.0L), 5);
+  TestSingleWcsToFloat(fn, L"0x1.2p3", static_cast<T>(9.0L), 7);
+  TestSingleWcsToFloat(fn, L"+1e+100", static_cast<T>(1e100L), 7);
+  TestSingleWcsToFloat(fn, L"0x10000.80", static_cast<T>(65536.50L), 10);
 }
 
 template <typename T>