diff --git a/test/test_const_multiset.cpp b/test/test_const_multiset.cpp
index d11c4098..cc59d41d 100644
--- a/test/test_const_multiset.cpp
+++ b/test/test_const_multiset.cpp
@@ -85,7 +85,7 @@ namespace
     return (lhs.k == rhs.k);
   }
 
-#if !defined(ETL_NOT_USING_CPP23)
+#if ETL_NOT_USING_CPP23
   // Equality operator for Key != Key
   constexpr bool operator !=(const Key& lhs, const Key& rhs) noexcept
   {
diff --git a/test/test_const_multiset_ext.cpp b/test/test_const_multiset_ext.cpp
index 1dcee7dd..781ce4e6 100644
--- a/test/test_const_multiset_ext.cpp
+++ b/test/test_const_multiset_ext.cpp
@@ -86,7 +86,7 @@ namespace
     return (lhs.k == rhs.k);
   }
 
-#if !defined(ETL_NOT_USING_CPP23)
+#if ETL_NOT_USING_CPP23
   // Equality operator for Key != Key
   constexpr bool operator !=(const Key& lhs, const Key& rhs) noexcept
   {