--- a/tests/test_json.c	Mon Jan 06 23:29:41 2025 +0100
+++ b/tests/test_json.c	Tue Jan 07 00:12:46 2025 +0100
@@ -747,7 +747,7 @@
     // write it to a buffer
     CxBuffer buf;
     cxBufferInit(&buf, NULL, 512, NULL, CX_BUFFER_DEFAULT);
-    int result = cxJsonWrite(&buf, obj, (cx_write_func) cxBufferWrite, writer);
+    int result = cxJsonWrite(&buf, obj, cxBufferWriteFunc, writer);
     cxBufferTerminate(&buf); // makes debugging easier
     CX_TEST_ASSERT(result == 0);