--- a/src/cx/common.h	Mon Dec 18 18:54:17 2023 +0100
+++ b/src/cx/common.h	Wed Dec 20 16:46:14 2023 +0100
@@ -96,6 +96,7 @@
 #include <stdint.h>
 #include <sys/types.h>
 
+#ifndef UCX_TEST_H
 /**
  * Function pointer compatible with fwrite-like functions.
  */
@@ -105,6 +106,7 @@
         size_t,
         void *
 );
+#endif // UCX_TEST_H
 
 /**
  * Function pointer compatible with fread-like functions.