diff --git a/cpp/winsharedutils/theme.cpp b/cpp/winsharedutils/theme.cpp
index 4fbce1b5..3be9a678 100644
--- a/cpp/winsharedutils/theme.cpp
+++ b/cpp/winsharedutils/theme.cpp
@@ -209,5 +209,7 @@ DECLARE_API bool isDark()
     if (ERROR_SUCCESS != hKey.QueryDWORDValue(L"AppsUseLightTheme", value))
         return false;
     return 1 - value;
+#else
+    return false;
 #endif
 }
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