diff --git a/src/util/string.h b/src/util/string.h
index e674c0ab8b6f..357235234ea4 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -76,9 +76,9 @@ inline QString convertWCStringToQString(
     const auto ilen = static_cast<int>(len);
     DEBUG_ASSERT(ilen >= 0); // unsigned -> signed
     switch (sizeof(wchar_t)) {
-    case sizeof(ushort):
+    case sizeof(char16_t):
         return QString::fromUtf16(reinterpret_cast<const char16_t*>(wcs), ilen);
-    case sizeof(uint):
+    case sizeof(char32_t):
         return QString::fromUcs4(reinterpret_cast<const char32_t*>(wcs), ilen);
     default:
         DEBUG_ASSERT(!"unsupported character type");