--- a/src/cx/collection.h	Fri Dec 19 14:13:49 2025 +0100
+++ b/src/cx/collection.h	Fri Dec 19 14:14:22 2025 +0100
@@ -204,7 +204,7 @@
  */
 #define cxSetAdvancedCompareFunc(c, func, data) \
     (c)->collection.advanced_cmp = (cx_compare_func2) func; \
-    (c)->collection.destructor_data = data
+    (c)->collection.cmp_data = data
 
 /**
  * Invokes the simple comparator function for two elements.