diff --git a/include/magic_enum/magic_enum.hpp b/include/magic_enum/magic_enum.hpp
index a4ea49a..d050c77 100644
--- a/include/magic_enum/magic_enum.hpp
+++ b/include/magic_enum/magic_enum.hpp
@@ -60,7 +60,7 @@
 
 #if defined(MAGIC_ENUM_NO_ASSERT)
 #  define MAGIC_ENUM_ASSERT(...) static_cast<void>(0)
-#else
+#elif !defined(MAGIC_ENUM_ASSERT)
 #  include <cassert>
 #  define MAGIC_ENUM_ASSERT(...) assert((__VA_ARGS__))
 #endif